On March 22, 2012:
I have the Penguin 350B. It does a great job on my 29 gal. tank. The water is crystal clear. Changing out media is a snap. Some say that it is quiet, others say it is noisy. I say it is in between. I have had filters that did as good a job as this 350B but, they were canister filters. I really like the wet/dry bio-wheels. A lot of surface area for bacteria. The filter does require a little clean up from time to time but all other filters do too. The 350B may be a little bit to powerful for a 29 gal. tank. The surface water is kinda like rapids. Fast moving. So, if you use this filter on a 29/30 or smaller aquarium it would be best to house fish that like that type of water. Mine does! So, for the price, this filter is worth every penny. For what it does it is cheap! Just remember to maintain the filter as instructed by the manual and you will be very happy.

On February 5, 2012:
I have the Penguin 150B and it is the perfect filter for my 30 gallon fish tank. It is SUPER QUITE and ROCK SOLID. It puts plenty of oxygen back into the water by moving lots of water. I would recommend to anyone. It's a very dependable filter and easy to clean.

On December 28, 2011:
This filter keeps the tank crystal clear! I love it!

On December 17, 2011:
I use it for my 23gal quarantine/grow out tank and it keeps it clean

On November 19, 2011:
I was skeptical about this filter because of it's low price. I was wrong! What a great filter!! It keeps my 20 gallon tank sparkling clean. Filter elements can be rinsed several times to save money on replacements. Replacement filter elements are very inexpensive. Great value!! I have read the other above reviews complaining about noise...my filter is whisper quiet and doesn't make a sound. Perhaps the other reviewers have their filters set up improperly?

On October 30, 2011:
I had old filters for 2 tanks that I was trying to set up in my classroom at school. It was cheaper and easier to buy 2 new ones and know what I had, than to try to find oddball filter cartridges all the time. They are great filters for what I need.

On October 26, 2011:
This filter is excellent and you can not beat the price.

On May 4, 2011:
Item shipped fast and was as expected. The Penguin Bio Wheel power filter works great! Thanks!

On April 4, 2011:
I love love love this filter because it's so easy to set up, replace cartridges, does an amazing job filtering, and it's so WONDERFULLY QUIET! I have Marineland filters in my 5g Hex, one each on my two 55g tanks and another on my 20g tank. Great buy for the price! Will get another in a heartbeat!

On October 14, 2010:
Penguin mini filter works great. A lot more powerful (flow) than the previous earlier model mini we had.

On October 14, 2010:
At first, the filter made horrible splashing noises as the water came out of the filter. I even made sure the water was high enough. Ends up that I had the water a little too high; it is much nicer when the tank water is at the level of the exiting water. Also the biowheels had to become "absorptive" after a period of 24-48hrs. I have the filter on a 55g tank in my bedroom, and it is VERY quiet. The soft trickle of water is even a little soothing. Water is still crystal clear so far...Love this filter!

On September 16, 2010:
This is a great filter, made my 55 gallon crystal clear in a few hours, great investment. You don't even know how bad your old stuff is until you replace it. Best price I could find on the net.

On August 10, 2010:
I have this filter in my 45 gallon tank and it does a great job! The filter isn't dead silent, but it nice and quiet. Marineland had great products so if you're torn, I recommend this filter.

On July 13, 2010:
I bought the Penguin Bio-wheel 200 for my 33 gallon tank. It does a good job, but it does not do it as good as i expected. I still have to sweep out my tank every 2-4 weeks. I do not overfeed them and the Nitrate and Nitrite cycle has already set up. I have about 15 fish so it's not overpopulated either. But i think that it is definitely worth the money and does the job... the filter media is not too expensive either. I later bought the Marineland Emperor 400 for the 33 gallon tank. I was going to buy the 280 but there was only an $11 difference so i said u cant have too much filtration right? I've had the 400 for about 5 weeks now and I have not had to sweep out the tank yet, so i am very impressed w/ it. i Definitely recommend the Emperor.

On June 24, 2010:
It's my first time to set up my fish tank, don't have experience to do comparison. But I can see this filter work very well, strong enough to clear my 60 Gal tank.

On June 8, 2010:
I have a Bio Wheel Power Filter Lid system on my saltwater tank and it works great! It is a full hood unit on a 29 gal tank. I am looking at buying another one for my 55 gal tank!! Very easy to maintain!

On May 26, 2010:
350 Bio Wheel unit better packaging , but does not have the flexibility of the 330 unit, such as pockets for charcoal or ammo chips allowing user to adjust filtration system for specific tank conditions.

On April 21, 2010:
This is my first tank (55 gal) and first filter so I would say its a good filter not having had any experience with any other filter. My tank was cloudy after I added my pebbles, but it was clear the next day. I would say it is relatively quiet. The only time that you can hear the motor is when there is absolutely nothing going on in my apartment and at that time it is still not bothersome.

On March 14, 2010:
I purchased the 350 for my 55 gallon tank and I must say it does a great job. I have two channel cats and three Oscars that mess it up pretty well. Great product. I will buy another

On January 26, 2010:
I am an avid turtle keeper. I use this in a 55 gallon tank full of water. In the tank there are two full grown Helmeted turtles, this might not mean much, but simply put. These are VERY messy turtles. This filter keeps the water crystal clear all the time, one of the best!

On December 10, 2009:
I was replacing a Penguin Bio Wheel Power Filter by Marineland that was at least 15 years old (maybe more) and I was so impressed with the longevity of the one I had that I bought the new version of the same thing! It is up and running (very easy to set up) and works great.

On September 28, 2009:
I am very familiar with this line, having used many of their filter products (diff sizes) for many years (older version) and bought the 350B for several reasons beyond the fact that I liked the performance of their products from prior use. The size of space behind my 75 fit exactly (with no margin to spare and I did not wish to drain and move it at all, lol), the extension tube (black as well as I want to disguise the works - blue black background) and I had created two floating rocky sculptures and the tube fit right between this sculpted rock area. OT (For anyone who might wish to know the diy how to (black crate plastic or go to place like staples and get a black file holder - plastic thing with holes - cut desired shape, heat gun and two part (hard seal) plumbers putty - to attach rocks placed as designed (with silicone layer sprinkle of sand over the putty after it dries to seal and sand to disguise) and entire thing hangs over edge of aquarium (left over versa top black middle part - heated to curve ie hang like hanger over edge - weave in between openings of plastic grate and one can use either black plastic mesh, or bits of plastic to "weld" it where needed - I make mine more 3 d ie rocks stick out into tank to create a "floating" look of rocks - black blends with background.) The two falls area (out flows) fit this design perfectly and the extension tube was further down into the aquarium then many filters for this size tank (which automatically excluded them for my purposes as I wish to create flow from the bottom). I will be adding extensions later. I know that even with the occasional trouble (and having used many different brands before, what filter does not have them) (which is solved by regular maintenance ie stuff gets trapped around impeller, usually a strand of moss, floss so on) (over time the bio wheels DO stop spinning even with regular cleaning - the material breaks down a bit over much time (years) solution is to replace) - I really like the professional quality and reliability of this product (along with the older Aquaclear - (have not tried newer models so have no opinion)). There is a great manufactures warranty, just called and all one need do is save your Petmountain receipt! (or email receipt) As well, I pack my own with filter material to save money and double filter, under stock (will be adding Aquaclear to right side of tank for bio balls and can reduce flow on this side so middle of tank has a quieter flow area for resting fish. The Aquaclear as well allows one to adjust the flow.) But the big plus (since I already knew and liked this product) is the excellent customer services and pricing from Petmountain (believe me I looked all over the web and it beats significantly the local stores) (the rep matched a price I saw a few bucks for less - as they state they will within parameters) and lowered it both on site and on my shopping cart within minutes during our conversation! I spoke with customer rep prior to ordering as I narrowed my decisions and unlike some sellers online they said they would pay for return shipping if something was broken. (again all packed superbly, even the prime and conditioners had masking tape around the seal of top cap to add extra travel protection - that was impressive!) With the then free shipping window of price over 100 I sent my order in immediately - had compared prices for a week or so... (I know now to check all the time - seems that have deals galore.) Tracking for shipping and arrival right on time - expertly packed (large box) and all there and nothing broken. Got the box today, took all things out, rinsed my filter, packed with media (only two panels for one side which I did not realize when ordering but ok since I packed the other side with my choice) (could be bio balls, more floss, padding to clarify so on) and plug and play. Primed easily (ok a slight tap of tube to make it fit down far enough) and it was on it's way doing it's job! I am sold on Petmountain! I will spread the word to various aquarium/vivarium forums as I want them to be in business a LONG time! I will most definitely be buying my products from Petmountain from now on (what I need and they carry.)

On August 31, 2009:
Re: This post about using copper. COPPER is highly toxic to all fish (used in meds for short duration only and many no longer use it as it stays in the fishes system ie heavy metal) and kills the bio cultures and inverts. Please research this and DO NOT use copper pipes or tubing. (I have to prefilter all my water due to copper pipes in the building). <<350B Impeller Noise By Steve from Ringwood, NJ On January 21, 2008: The Penguin 350B was very quiet for four months, then the impeller started making noise. When it does, you have only weeks or days before it stops working completely. A very good fix is to go to your local hobby shop and rebuild the plastic shaft from copper tubing. It will take a bit of effort but is worth it in the long run. >> That said, I've used many of these filters (different sizes) and overall a great product. I pack my own filter bags and if you wish to extend the tubing use plastic.

On June 26, 2009:
This is a great basic filter. It's easy to put together and easy to take apart. I actually use it for our turtle so I have to clean it more often than a person with a fish aquarium would, but if it works so well with a turtle, it must be perfect for a small fish aquarium! The waterfall provides soothing noise. Only downfall - the waterfall sounds great but tends to splash. Leave it away from items easily water damaged or likely to stain from hard water deposits.

On May 20, 2009:
I've had the old ones, the mini, the 170, tried Rena and had lots of problems getting the bio to get established enough to absorb the nitrates & ammonia. Came back to the bio wheel with a 100, 150 & a 200. Gets the tank going right away, although the initial noise level is high, it quiets down after it loosens up. Still a loud tinkling of water sound, so if you don't mind that, it's good as it is adding oxygen.

On February 26, 2009:
I am using the 350 as a bio/chemical filter on my 75 gallon tank (I have a 350 magnum set up for mechanical filtration on the tank also). I have a foot long sailfin pleco with other community fish and the 350 magnum was great for mechanical filtration, but I was always battling ammonia and nitrates/nitrites. I added the 350 penguin and saw improvements very quickly. It runs quietly and smoothly and is easy to clean. I added the extra filter baskets with Purigen, plus Supercartridges with carbon pads and couldn't be happier!!

On October 8, 2008:
This is a great filter for the price!!! I am using it and a power head in each of my breeding tanks....

On February 13, 2008:
I was skeptical about bio-wheel filtration, but let me tell you.... The Penguin Bio-wheel 350B keeps my 55 gallon cichlid tank in perfect condition.

On February 1, 2008:
The Penguin Bio-Wheel 100 has done an excellent job in my 20 gallon tank. I replace the filter cartridge every 3 weeks and the water has been crystal clear and ammonia free. Excellent product for the price. I highly recommend this product!

On January 27, 2008:
I have owner Biowheels from back when i was a child. I swear by them. The new cartridges don't seem to be made as well. The foam seams to deteriorate, but many people have suggested just stripping it off and creating your own filter bag. I still love this filter.

On January 21, 2008:
The Penguin 350B was very quiet for four months, then the impeller started making noise. When it does, you have only weeks or days before it stops working completely. A very good fix is to go to your local hobby shop and rebuild the plastic shaft from copper tubing. It will take a bit of effort but is worth it in the long run.

On January 6, 2008:
The Penguin bio-wheel filter line is incredible. I have both the 200b and 350b filter on my 46 gallon tank to make sure that it's filter properly. These filters keep the tank sparkling clean and never fail or overflow. However, they are a bit loud until the bio-wheel starts to grow bacteria, then their pretty quiet. If you are looking for a quality bio-wheel filter at a decent price, MarineLand's Penguin filters are the way to go.

On September 24, 2007:
I have the 200B Penguin filter and it works like a charm. It's quiet and does an excellent job of keeping my fish tank crystal clear. You will need to introduce some ammonia into your fish tank to start the nitrogen cycle before the bio wheel will start working though.

On September 2, 2007:
Running a Penguin 100B in a 10 gallon aquatic turtle tank (2 baby Red Eared Sliders). Very quiet filter, and capable of holding its own against the tank's unusually messy inhabitants. Rated for 20 gal, its performance in a 10 gal with turtles leads me to believe that it has plenty capability to maintain a 20 gallon with a reasonable stock of fish. Media change is a breeze, but pads are pricy while the filter is first setting up.

On July 28, 2007:
This filter works tremendously and I have had only a few minor problems with it here and there. Occasionally if your filter cartridge isn't seated properly the Bio-Wheel will stick in position. Usually it will only take an extra second or two to rearrange the filter to get the Bio-Wheel fully operational. The filter leaves your water looking clean and polished very quickly even when you stir things up a bit during a water change.

I also found that my tank seemed to have cycled somewhat quicker with the Bio-Wheel compared to a few other tanks I have set up.

On July 10, 2007:
I have the 200B model, as an upgrade from the old penguin bio-wheel. I was very impressed by the water flow, at least 3x more than I was used to getting. I also like the dual intake.. you can't see it in the picture here, but it has a second intake on the tube about halfway up.

On June 24, 2007:
Great filter. Replaced a new whisper 30 with this filter and the water is 10x clearer after just a couple of days. Also the ability to double the filters is great for increasing the bio-filter. Over-filter for crystal clear water or if you are overloading with fish. I'm using the 350b for a 29g

On May 20, 2007:
I have the penguin 350 on my 55 gallon tank and it works miracles. When I used to clean the tank the water was just plain nasty, now when I do it the water I remove is just about clean. I would recommend the penguin filters to anyone.

On March 27, 2007:
I have used the Penguin 350B in my freshwater tank and it does wonders. Keeps my tank spotless all the time. Also maintenance is a breeze.

I would recomend this filter to anyone wanting a great filter!

On March 22, 2007:
This is a heavy duty filter that provides my fish with all the valuable ingredients of survival.

On January 22, 2007:
We had a tetra power filter prior to our purchase of the Bio wheel, there is a significant difference between the two. We are able to prolong water changes and we notice the fish are not as irritated by the water when using our Bio wheel.

On December 19, 2006:
This item is compact, quiet, inexpensive and absolutely worth it. A great buy indeed. It works excellent with my 10 gallon tank and is great because it is external.