✨ Aquapapa Aquarium Filter Media Zipper Mesh Bags: Ultimate Solution for Pellet Carbon, Bio Balls, Ceramic Rings and Ammonia Remover Review

Actually, there is quite a lot of activated carbon stored here. The pore size is relatively small, so you don't have to worry about fine grains seeping through. I had to take half the charcoal out of the bag as my aquarium filter wasn't performing as efficiently with the amount of charcoal it could hold.

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.

These media bags have a metal zipper. For those who don't know, metal in an aquarium is toxic, especially in seawater. In the filter, it is subject to corrosion and rust. Then comes the metal coating. Who knows what chemicals were used in the manufacture. If you have a freshwater aquarium and can hold metal out of the water, then you're fine. But if you have salt water you cannot use these bags as the metal will corrode and rust just being around salt water. I offered the seller an alternative…