Key Features Fits all Hang on Filter models. Dual action filter cartridge for crystal clear water. Carbon activated filter foam and 2 micro filter pads. Absorbes dyes and toxic subsances from water. Easy to connect and install. Dual action filter cartridges designed to fit the Hang On filter series from SuperFish, consisting of a carbon activated filter foam along with 2 micro filter pads. The activated carbon foam helps to absorb dyes and toxins from the water, keeping your water clear & healthy, whilst also ensuring the water pH stays neutral. Easy to install and replace for use in Hang On 100 & 200 filters. It is recommended filter cartridges are replaced monthly. This pack contains 2pcs.