I wrote for another review of these sponges, I really appreciate the PPI sponge sales API. I love using them on everything from canister filters to cooktops. I prefer to go from 20 ppi upwards until I get to fine filters, then more biological media and then Seachem Purigen. Or go the GreenAqua route and go straight from 30ppi to organic backings, purigen and finally thin pads. Crystal clear water every time.
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