These are the same ceramic biocarriers in a larger size. If you have a smaller filter, use regular biomaterial rings as they are not suitable for hanging filters. If you want to hide them separately in the back of your tank, a rectangular ceramic filter might be better as you can stack them on top of each other. In general, they work the same as other filters. The price is comparable to other bio carriers: 1 pound or 1 liter for $10. At the time of writing this review it was $20 for 2L.
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