It's really huge I cut it in half and since it's open on both sides I used a latex glove on the underside of the canister filter inlet adapter to prevent the water from just coming in from the side invades, catches all kinds of food, great for a shrimp party. I see them constantly feeding on this foam, its very large holes are quite large for non-live carrier fry and of course shrimp. Just looking at it, I could tell that its smallest filter grain is 1mm, but it's thick enough to fully capture the dirt sucked in. Update: almost a year and a half since purchase. The product, both used and unused, keeps its shape and does not deteriorate. quality item.
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