Don't sacrifice functionality to attain a quieter noise level when you can have the quiet power of a Fluval Air Pump. This strong, extremely quiet air pump produces consistent air flow thanks to an advanced swing-arm and diaphragm design. With a thick double-wall outer casing, an integrated pump well and a noise-suppressing baffle chamber, this Fluval Air Pump is one of the quietest and most efficient air pumps to date.
Ultra quiet design
Provides consistent air flow
Reliable and long-lasting
Fluval Impeller Cover 304/404 - 305/405 (New Style)
Hagen Impeller Cover Fluval replacement par. Impeller Cover Replacement part for the Fluval 304-404 and 305-405 Filters made after July 2001.NOTE: Please make sure your impeller has straight fan blades. (If your filter is older than July 2001 and/or has pink and curved fan blades then you will need to purchase the OLD MODEL: Part Number A-20155)
Hagen Fluval carbon 3 pack is very pure activated carbon that is ideal in both Fresh and Salt water. The inner matrix structure provides a large porous area that permanently traps organic waste while removing liquid wastes such as urine, dyes or many other impurities from the water. The result is sparkling clear aquarium water.Each bag is packed with 100 grams of carbon.
Vuetech E Series Heaters employ an advanced digital microprocessor to continuously monitor and display aquarium water temperature. It contains an internal thermal sensor that continuously samples aquarium water temperature for greater accuracy and reliability.
The most technologically advanced submersible aquarium heater available today
Safe for for freshwater and saltwater aquariums
Thermal sensor that continuously samples aquarium water temperature for greater accuracy and reliability
The manufacturer does not state the range that the heater can be set to. Merely the actual temperature with high and low alerts on the LED. The Vuetech E Series Heater innovative color-coded temperature alert feature changes LCD screen color if aquarium water temperature varies from the pre-set temperature (Green = Safe Zone, Red = High Temperature Alert, Blue = Low Temperature Alert). The Vuetech E Series Heater has an easy-to-use adjustment lever that allows precision temperature settings in 0.5° increments and integrated heater guard offers advanced protection for fish and invertebrates.
Fluval 304, 305, 404 and 405 Impeller Shaft - (New Style)
Hagen Impeller Shaft for Fluval 304, 305, 404 and 405 models manufactured BEFORE July 2001 require (Old Style) impeller Shaft!
For Fluval 304, 305, 404 and 405
With Rubber support For impellers
For impellers with straight fan blades only
Blister box
Fluval Foam Block 204/205 and 304/305 is designed specifically for use with the Fluval 204/205 and 304/305 filter. It effectively removes particulate matter mechanically.It also allows thriving populations of beneficial bacteria to aid in the establishment and maintenance of the biological balance in the aquarium.Dimensions: L,W,H: 2 3/4"x 1" x 8 1/2" .
Fluval Bio-Max rings (500gr / 17oz) are unique, inert ceramic rings that promote powerful bacterial growth both internally and externally. Each ring is very porous, with holes that are perfectly sized to host beneficial bacteria.The massive internal and external surface areas allow huge colonies of beneficial bacteria to grow, making Fluval Bio-Max an ideal media for biological removal of both ammonia and nitrite concentrations in the aquarium.
Fluval Pre-Filter Media (750 grams) consists of inert, solid ceramic rings used to trap large and medium solid particles before they clog the finer sieves of the modules above. The diversified water flow allows establishment of biological activity on the surface of the rings, adding to the overall biological action on ammonia and nitrite.
Over time wear and tear of the motor and motor parts can reduce pump performance, The Motor Seal Ring for Fluval 104-05 & 204-05 will help ensure reliable performance of your pump.
Fluval 404/405/406 Foam Filter Block is designed specifically for use with the Fluval MSF 404 and 405 filter. It effectively removes particulate matter mechanically.Fluval 404/405/406 Foam Filter Block also allows thriving populations of beneficial bacteria to aid in the establishment and maintenance of the biological balance in the aquarium.
Hagen Fluval Tubing is Ribbed, Flexible, non-kink hosing usable for all applications with Fluval 305 / 405 and Fluval 304 / 404.This is only one hose at 9.5' long. The ends pictured are the two ends of the same tube.
Fluval Underwater Filters are powerful 3-stage filtration systems perfect for aquariums and reptile environments.
Easy flip top for fast maintenance
3 Stage filtration is ideal for freshwater, marine or reptile environments
Includes submersible filter, 1 foam pad, output diverter and 3-way flow rate control
These filters are perfect as primary filtration in smaller aquariums and supplementary filtration in larger aquariums. Also great for tanks with low water levels and will run efficiently in a horizontal or vertical position. Cord length is 6 feet!
Dimensions:U1 - 2.75 in. x 2.25 in x 6.75 in.U2 - 3.5 in x 3 in. x 8 in.U3 - 3.5 in x 3 in. x 10.5 in.U4 - 3.5 in. x 3.5 in x 13 in.
Fluval Hose Brush maintains, cleans, and beautifies your aquarium hosing. Fluval's hose brush does the job quickly and easily!Cleans up to 36" hose length and fits all hoses up to 5/8 inch in diameter.
Fluval Ribbed Hose Adapter 2 per Pack by Hagen.
Available in 2 models: 30016: 105-205 and 30017: 305-405.
Diameter for for model # 30016: The ribbed end is 1 1/8" and the other end is 1/2". Diameter for model # 30017 The ribbed end is 1 1/4" and the other is 1 1/8".
Replacement Filter Canister RETROFIT for the old style Fluval 404 Filtration Units. The old canister is no longer made and this is the recommended solution.This kit contains replacement filter canister, two new-style lift lock clamps and motor cover.This is for the Old Style 404 and will not fit the New Style Filter
Fluval C-Series Aquarium Power Filters are five-stage filter units. These filters hang on the side of your aquarium and provide superior filtration of your aquarium water.
Customizable 5 Stages of Filtration for excellent water quality
2 additional filtration stages compared to traditional power filters for cleaner and healthier aquarium water
C Series Power Filters come with everything you need to hang on the tank and plug in for quick installation
The Fluval C Series Power Filter Systems are the first power filters that use five stages of filtration for excellent water quality. This five stage system features two mechanical filter layers, one chemical filter layer, and two biological filter layers.
Stage 1 - Mechanical Filter which uses a porous foam filter to trap large particles and other impurities in your Aquarium waterStage 2 - Mechanical Filter which uses a dense poly-foam pad to rid your Aquarium of debrisStage 3 - Chemical Filter uses activated carbon to remove unwanted odors and contaminantsStage 4 - Biological Filter helps block debris from getting into the biological stage and provides a larger surface area for filtrationStage 5 - Biological Filters contain oxygen and are used in the Fluval Biological Trickle Chamber to help reduce toxic ammonia and nitriteThe Fluval C Series Power Filters are high performing filters which provide your Aquarium with maximum filtration to prevent clogging, resulting in beautiful clear water!
Help maintain clear water - Traps tiny particles & debris - Polishing pad - For Fresh and Salt water - 3 pieces per display pack Fluval Fine Filter Pads are uniquely designed to fit Fluval FX5 High Performance Canister Filters. These polyester pads capture small particles and debris that can cloud water, and help maintain clear water.Fluval Fine Filter Pads should be used in conjunction with Fluval Water Polishing Pads to optimize the purity of aquarium water. For freshwater and marine environments.
For freshwater and marine environments
Bottom Media Basket
Captures small particles
Helps maintain clear water
The pads are 6 1/2" in diameter.
Fluval polishing pads are uniquely designed to fit Fluval canister filters. These polyester pads capture small particles and help maintain crystal clear water. Use Fluval polishing pads after using Filter Polishing Pads to maintain water clarity.
For freshwater and marine environments
Place in top or middle media baskets
Effectively traps micro particles and debris for crystal clear water
Fluval Water Polishing Pads-Fine are uniquely designed to fit Fluval Canister Filters. These extra thick micro-fine polyester pads effectively trap micro particles and debris as water passes through.Fluval Water Polishing Pads are ideally used when cloudy water occurs or after tank maintenance to provide crystal clear aquarium water. For freshwater and marine environments.Fits model 304, 305, 306, 404, 405, 406
6 Pack
Clears cloudy water
Extra thick, Micro-Fine Polyester
FX5 High Performance Canister Filter - (400 Gallon)
Fluval FX5 External Filter is available from Swell UK at an unbelievable price. The Fluval FX5 is a large capacity, multi-stage external canister filter system.
Pumps in excess of 925 GPH
Allows the precise management of water conditions for aquariums of up to 400 gallons
The FX5 Canister Filter has a self-priming instant-start system that eliminates the need for manual siphoning
3 Year Manufacturer Warranty
Unique click-fit AquaStop Valves that regulate water flow, rotate at 55 degree angles and allow for fast set-up and leak-proof maintenance. A purge valve that allows for partial discharge of debris without needing to move the unit. Multi-directional twin output nozzles to create specific water flows. Fluval FX5 Smart Pump Technology (patent pending) ensures quiet, efficient operation. This self-priming system provides plug-in-and-start convenience.Fluval FX5 Canister Filer Features:9.8 ft (3 m) of 1" diameter tubing, foam filter blocks, 3 removable media baskets (1.5 gallon total media capacity), instructional DVD, and hard copy of instructions. Compact FX5 Filter Measurements - 17" Tall x 16" Diameter and consumes only 50 Watts.High Capacity - Capable of storing 1.5 gallons of filter media and recirculating 925 gallons of water per hour. Smart-Pump Chip - A computer chip monitors the pump, taking measurements to ensure efficiency. Every 24 hours the pump automatically stops to release air trapped in the system. Multi-directional Output Nozzle - Twin output nozzles can be adjusted to create specific water flows to reach all areas of the aquarium. Easy to Use - With the FX5, no manual siphoning is necessary. Once everything is hooked up the filtering process begins automatically. Of course, included is an instructional DVD helpful for novices and experts alike. Media Customization - The stacking media baskets allow you to layer your media in a precise manner. A foam insert in the baskets allows for mechanical pre-filtering. Maintenance is simple due to the instant-release handles that separate the baskets. Efficient - The FX5 has several measures to prevent clogging and damage to the system. Aquastop valves provide an easy way to stop water flow for maintenance. Click-fit connectors create a leak free connection and the clog-proof intake strainer repels debris.
Hagen Fluval 304 - 305 (New Style) Impeller Replacement Part For Fluval MSF Filters manufactured AFTER July 2001- With straight fan blades- Impeller shaft sold separately
Fluval U Series Filter Poly / Carbon Cartridges have two sides for the most effective filtration. The U Series Cartridges is a polyester filter pad which filters out fine debris and contaminants and a carbon side which filters out harmful liquid substances, colorants and odors. Please see below to find the proper cartridge for your U series filter.
Stage 2 Poly / Carbon replacement cartridge
Improves water clarity, traps debris & removes odor from aquarium water
Fluval Underwater Filter replacement Poly/Carbon Cartridge 2 Pack
Over time wear and tear of the motor and motor parts can reduce pump performance, The Impeller Cover for Fluval 204-05 (new style) will help ensure reliable performance of your pump.
The newly refined Fluval 06 series of aquarium canister filters with new more powerful motor adds extra conveniences to the powerful and flexible Fluval filtration line.
Fluval Filter has an Upgraded Motor & Filter maintains water flow vital to efficient filtration
Provides complete, multi-stage mechanical, chemical and biological filtration for aquariums
3-year warranty
Each Fluval Multi-Stage 06 Series Filter minimizes filtration worries with a series of convenient features. Aqua-Stop Valve permits hose disconnects and easy-open, one-motion lock clamps makes routine cleaning and maintenance easy. Added to the ability to customize filtration with multiple, removable media baskets and adjustable flow rates, and you've got a canister filter that is convenient, efficient, and very powerful.Fluval 06 Series Filters Include:Instant-prime system, single-motion lift-lock clamps, clog-proof intake strainer, tubing, dual-layer foam screen, canister housing, motor and quick start guide.
Fluval 4 Plus Carbon Pads (4-Pack) are designed as standard filter medium for Fluval Plus Underwater Filters. They maximize surface contact between the water and the media for more efficient filtration, while maximizing the colonization of beneficial bacteria.
Developed to remove discoloration, dyes and medications
Removes noxious odors
4 per pack
Fluval Foam (4 plus 4-pack) provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack.Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.
Size: 9" X 3.25" X .75"
Fluval C3 Stage 3 Zeo-Carb is replacement chemical filter media. This is a combination of activated carbon and ammonia remover used to help absorb unwanted odors, discolorations, and other impurities. This chemical media also helps prevent toxic ammonia from building up in your aquarium. The activated carbon will help reduce the amount of particulate matter and remove any trace amounts of chlorine all while helping improve your aquarium water clarity. Zeo-Carb packs become inactive over time and should be replaced roughly twice a month to help maintain your water quality. Size: 3 Pack
Fluval Ammonia Remover is a natural ion-exchange media designed to remove toxic ammonia as a water passes over it. Fluval Ammonia Remover controls ammonia levels reduces stress on fish. Use this product to provide a healthy environment when setting up a new aquarium or maintaining one that contains a higher than average fish stock. Ammonia Remover gradually becomes inactive.
Top or Middle Media Baskets
For freshwater use only
Impeller Shaft Assembly for Fluval 104 - 204 and 105 - 205
Over time wear and tare of the motor and motor parts can reduce pump performance, The Impeller Shaft Assembly will help ensure reliable performance of your pump.
Fits Fluval 104 and 204 Canister Filter
Fits Fluval 105 and 205 Canister Filter
Impeller sold separately
To buy the Impeller - Click Here
Fluval Underwater Filter Foam Pads are filter media that will trap large particles and debris. Available pads: U1 foam pad, U2 foam pad, U3 foam pad and U4 foam pad.
Fluval Underwater Filter replacement Foam Pad
Removes large particles from aquarium water
Stage 1 foam pad replacement
Fluval's Biomax replacement for "U" Series underwater filters for U2, U3, and U4 filters.
Provides optimum biological balance
For Fluval Underwater Filters - U2, U3 and U4 Series
Bio-Max Replacement 6 oz - Rinse before using
Fluval Foam Pads for Power Filters are media for Stage 1 of the filtration process. These pads are made with porous foam to help trap large particles, debris and other dirt like substances in your Aquarium. These are especially helpful in aquariums that have a large population of aquatic life.
Stage 1 of the filtration process
Two foam pads
For C2, C3 and C4 filters
It is recommended that these foam pads be replaced every 2 to 3 months and can be rinsed clean with water between replacements.
Fluval Plus Polyester Filter Pads are a specially developed fine filter media that is ideally suited to filtering out extremely fine suspended particles and contaminants.Packed 4 pieces per display box / Polyester Filter Pads.
Fluval C4 Stage 3 Zeo-Carb is replacement chemical filter media. This is a combination of activated carbon and ammonia remover used to help absorb unwanted odors, discolorations, and other impurities. This chemical media also helps prevent toxic ammonia from building up in your aquarium. The activated carbon will help reduce the amount of particulate matter and remove any trace amounts of chlorine all while helping improve your aquarium water clarity. Zeo-Carb packs become inactive over time and should be replaced roughly twice a month to help maintain your water quality. Size: 3 Pack
Hagen Impeller Cover Fluval replacement par. Impeller Cover Replacement part for the Fluval 304-404 Filters made prior to July 2001. NOTE: Please make sure your impeller has pink and curved fan blades. (If your filter is newer than July 2001 and/or has straight blades then you will need to purchase the NEW MODEL: Part Number A-20156)
Over time wear and tare of the motor and motor parts can reduce pump performance, The Intake Strainer for Fluval 304-05 & 404-05 will help ensure reliable performance of your pump.
Foam Insert Fluval 3 Plus (4 pack). Fluval Foam provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack.Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.
Fluval 3 Plus Carbon Filter Pads are used for the removal of discoloration, dyes, harmful substances, extremely fine suspended particles and contaminants. It improves the clarity, color and smell of the water properties.Contains 4 Carbon Filter Pads.
Hagen Impeller Shaft for Fluval 304 and 404 models manufactured BEFORE July 2001 require (Old Style) impeller Shaft!
For Fluval 304 and 404
With Rubber support For impellers
For impellers with CURVED fan blades only
Blister box
Over time wear and tare of the motor and motor parts can reduce filter performance, The Lock Clamp for Fluval FX5 will help ensure reliable performance of your filter.
Impeller Assembly with Magnet for Fluval 104 - 204 and 105 - 205
Over time wear and tare of the motor and motor parts can reduce pump performance, The Impeller Assembly with Magnet will help ensure reliable performance of your pump.
Fits Fluval 104 and 204 Canister Filter
Fits Fluval 105 and 205 Canister Filter
Impeller shaft sold separately
To buy the Impeller Shaft - Click Here
1st Generation Impeller for Hagen Fluval 404 (Curved), Magnetic Impeller. For filters manufactured BEFORE July 2001.
With curved fan blades
Impeller shaft sold separately
Foam Insert Fluval 2 Plus 4-Pack provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack.Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.
Fluval BioScreen for Fluval C4 Power Filters are used as part of the stage 4 biological filter media and is used to block debris from entering in the final biological filter stage. These are designed with a micro weave core to cover large surface areas and to protect the stage 5 c-nodes from clogging. It is recommended that Bio Screens be changed every 1 to 2 months for optimal performance. They can also be rinsed in between replacements to add to your filters life. Size: 3 Pack
FLUVAL G Series advanced aquarium filters are so revolutionary in every way that it is destined to change the way filters are designed forever. Hagen has invested over two years of consumer research to build the perfect aquarium filter the new Fluval G Series canister filter.
New Revolutionary Fluval canister filter takes convenience to a new level with truly innovative features AND smart technology.
LCD monitor shows pump performance, conductivity and aquarium water temperature
Top load Media cartridges, Quick Stop Valves and an Easy Priming button makes maintenance quick and easy
2 Year Manufacturer Warranty
Each filter includes a Fluval G pre-filter mechanical cartridge, carbon filled chemical cartridge & G-Nodes, 10' Fluval hosing, Telescopic Intake with Strainer, 2 Output nozzles and 2 spray bar attachments, AquaStop System and a Quick Start Guide with Instruction Manual CD!
Easy to Use, Easy to Clean:Despite its cutting edge technology, Fluval G is one of the easiest filters you will ever see. Start-up is simplicity itself thanks to the one button self priming technology. Once running, maintenance is cleaner and easier than ever before. With the important biological media nestled safely in large capacity media baskets, the pre-filter and chemical cartridges remain easily accesible thanks to Fluval G's quick release system. The cartridges can be quickly removed without opening the body of the filter and rinsed or replaced as necessary.Hydrotech Performance Monitoring:With Fluval G's Hydrotech Performance Monitor, you are able to monitor many water parameters in real time. Water temperature, flow rate and conductivity are all easily accessible and can be viewed in graph format to monitor the aquariums performance over time.Minimum and maximum values can be set which, when exceeded, will trigger a visual alarm on the filter screen to alert you to problems.The Hydrotech Monitor also includes a maintenance schedule you can customise to your own requirements....so you'll never forget when that media change is due again.Other Features:-Fluval G's double wall construction provides exceptional soundproofing for truly whisper quiet operation.Silicone gasket provides superior sealing and long term reliability.Cast alloy locking levers are strong and non corrosive for a safe secire seal.Easy Prime with a simple button auto start.Aquastop quickly disconnects hosing.3 Stage Filtration:STAGE ONE - Pre filter cartridge. High capacity prefilter cartridge & No-BypassSTAGE TWO - Chemical Cartridge. High contact chemical cartridge accepts bulk or disposable media cartridgesSTAGE THREE - Biological Media Baskets. Fluval G Bio-Nodes - High capacity biological medium.
C-Nodes Biological Media for Fluval C4 Power Filter
Fluval C-Nodes for the C4 Power Filters are replacement media for Stage 5, biological media. These C Nodes for the Fluval C4 are enriched with oxygen and are specifically designed for the Fluval Biological Trickle Chamber to provide the perfect biological balance within your Aquarium. C-Nodes will help reduce the toxi ammonia and nitrite to ensure your aquatic friends thrive! Directions: Replace half of your C-Nodes every 6 months. The balance of beneficial bacteria can be compromised if you replace all of your C-Nodes at once. Size: 7 oz
Fluval Foam Block 104 - 2pk. is designed specifically for use in Fluval Canister Filters, these Foam Blocks effectively strain particulate waste, so that it doesn't clog the other filter media in the module stack.Its primary purpose is mechanical filtration, but biological activity will also occur within the pore structure. Rinse foam monthly in aged aquarium water and replace when the pore structure begins to break down. Dimensions L,W,H: 2 3/4"x 1"x 5 1/2".
Fluval BioScreen for Fluval C3 Power Filters are used as part of the stage 4 biological filter media and is used to block debris from entering in the final biological filter stage. These are designed with a micro weave core to cover large surface areas and to protect the stage 5 c-nodes from clogging. It is recommended that Bio Screens be changed every 1 to 2 months for optimal performance. They can also be rinsed in between replacements to add to your filters life. Size: 3 Pack
Over time wear and tare of the motor and motor parts can reduce filter performance, The Motor Seal Ring for Fluval FX5 will help ensure reliable performance of your filter.
Sea Aquatic Epoxy Stick provides bonding strength for aquascaping applications such as rock structures, corals and plants to decorative surfaces. This epoxy works on freshwater and saltwater aquariums and bonds and cures underwater. Easy to knead by hand, this bonding tool is non-toxic and safe for aquatic plants and fish.
Provides bonding strength for freshwater or saltwater aquariums
Safe for plants and fish
Easy to knead non-toxic bonding tool
Fluval Foam Insert Fluval 1 Plus (2pk). Fluval Foam provides mechanical straining of particulate waste. It prevents particulate waste from prematurely clogging other filter media in the module stack.Although the primary purpose of Fluval Foam is mechanical filtration, biological activity will eventually occur within its pore structure.
Fluval Inserts, 1 Duo-Density Cartridge - 3 Pieces - The Fluval 1 Filter Cartridge has been specially designed to trap large amounts of particulate and liquefied waste from the water.The double fused sheath design traps solid waste before it can clog the fine pores of the powderized carbon layer. This permits higher adsorption activity for a longer period of time.
Fluval 2 Plus Carbon Pads 4-Pack pads are designed as standard filter medium for Fluval Plus Underwater Filters. They maximize surface contact between the water and the media for more efficient filtration, while maximizing the colonization of beneficial bacteria.
Developed to remove discoloration, dyes and medications
Removes noxious odors
4 per pack
Over time wear and tare of the motor and motor parts can reduce filter performance, The Impeller Assembly for Fluval FX 5 will help ensure reliable performance of your filter.
Fluval Sea Hydrometer provides accurate measurements of specific gravity and salinity in marine aquariums. This easy-to-read hydrometer has clear markings and is compact and easy to use and can be installed inside a tank permanently for continuous readings or used as a portable device.
Accurately measures specific gravity and salinity
Easy-to-read
Compact with clear markings
C-Nodes Biological Media for Fluval C2 and C3 Power Filter
Fluval C-Nodes for the C2 & C3 Power Filters are replacement media for Stage 5, biological media. These C Nodes for the Fluval C2 & C3 are enriched with oxygen and are specifically designed for the Fluval Biological Trickle Chamber to provide the perfect biological balance within your Aquarium. C-Nodes will help reduce the toxi ammonia and nitrite to ensure your aquatic friends thrive! Directions: Replace half of your C Nodes every 6 months. The balance of beneficial bacteria can be compromised if you replace all of your C-Nodes at once. Size: 3.5 oz
Fluval G6 Mechanical Fine Pre Filter Cartridge for use with the G6 Filter System.
1 Fine Pre Filter - 75 pm
Use with the Flucal G6 Filter System for Mechanical filtration
Underwater Filter Foam Inserts are designed specifically for the Fluval 2 and 4 Underwater Filter. It is an effective mechanical media that removes debris from the aquarium and encourages populations of beneficial bacteria that are important in maintaining the proper biological balance in the aquarium. They also provide many locations for beneficial bacteria to grow. Rinse the foam every few weeks for best results. Re-use of the foam can help protect bacterial colonies and provide continual biological filtration.
Fluval BioScreen for Fluval C2 Power Filters are used as part of the stage 4 biological filter media and is used to block debris from entering in the final biological filter stage. These are designed with a micro weave core to cover large surface areas and to protect the stage 5 c-nodes from clogging. It is recommended that Bio Screens be changed every 1 to 2 months for optimal performance. They can also be rinsed in between replacements to add to your filters life. Size: 3 Pack