Be sure to keep the quartz sleeve clean so the brightness is not reduced. Please note these are not compatible with older models of the GreenFree Clarifier. The base of this quartz sleeve is black.
**Manufacturer product change** The current model has a solid green base with a notch on the inside of the base of the sleeve that keeps it from spinning around once the cap is inserted.
NOTE: New UV QUARTZ Sleeve fits (New Version) - effective 2011. The base of the quartz sleeve is black - please make sure the quartz sleeve your replaceing matches this style!