Review on 💦 Aqua Clear A612 50 Activated Carbon Filter, White, 2.4 Ounce by Charlie Conner

Suitable for AquaClear 50 HOB filter. I'm sure they will fit many other types of filters, but I can say with confidence that this one fits my 50. I use them when removing medication from my tank after treatment. The pouches hold up well but can easily tear if handled too roughly. Be sure to rinse them in a bucket of aquarium water or at least dechlorinated water before installation. If you don't do this, the water will become heavily clouded with coal dust.