I have 2 marine filters so the twin pack is perfect for me. They work very well. I change them about once a month but I wash them in aquarium water which I pump out about every 2 weeks. I have one in a tank with two African Dwarf Frogs and another in a tank with roosters. They definitely work. They collect a lot of particles and the water stays crystal clear. LOVE THESE! And I love that I don't have to go to the pet store to buy them. I will continue to order these!
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