Depending on the amount of fish, they may need to be cleaned often.

I happen to have a lot of fish so mine need to be cleaned every three days. However, it is absolutely critical that the sponges are cleaned thoroughly prior to first use. Make sure all the water eventually runs clear through it. The sponges work great over my Fluval 50 and Fluval 30 filter intakes. It keeps all my frys safe and sound from the intake current.

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