We use these cartridges in our Bio-Wheel Penguin filter. We have a 55 gallon freshwater rig that will hold 15 fish total, ranging from an 8" Pleco to a school of (of 5) 3/4" neon tetras. We wash the filters every two weeks and change them approximately. every 4-6 weeks and 15-20% water changes every 6-8 weeks. Our tank stays sparkling clean and the ability to purchase large packs makes our tank maintenance even more convenient.
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