I really like these. I have a 29 gallon aquarium and use them in my Aqueon Quiet Flow 50 filter. I stopped buying Aqueon replacement filters and started using these packs. I have one filled with Seachem Matrix and another filled with Marineland Diamond Blend Premium Ammonia Neutralizing Blend. The bags are a little bigger than I need but I just roll up the excess before putting them in.
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