Review on Tetra ReptoFilter Cartridges Whisper Technology by Marie Jensen

later These filters are a direct replacement for the filters we use in our stone waterfall and they hold up very well considering they hold water for 2 frogs and a very large goldfish filter. . When the water slows down and flows out of the waterfall, we simply pull them out, rinse them and reinstall them. Normally we only have to replace them completely after about 3-6 months. When you install them for the first time, you need to rinse them with cold water to wash off the charcoal dust and activate the charcoal. I will continue to buy them until we no longer need them. Pros: price, ease of use, enough for a reasonable amount of time. Cons: Comes in a pack of 3 (we use 2 at a time).