This is my favorite filter media for aquariums and ponds. They are low maintenance and do a great job of keeping my water clean and safe. I use them in overflow, canister and settling systems. My aquariums range from 27 to 220 gallons and my pond is 2000 gallons. They all work very well with this carrier. I had a couple of partially broken balls but that was to be expected. A few hundred is no problem. Highly recommended!
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