A flocculant (e.g. AQA marin flocculant cartridges) ensures that the so-called filter sharpness increases. The flocculant binds the smallest suspended particles or dirt particles into larger complexes/particles that can be filtered away by the pool filter and removed from the pool via backwashing. This significantly increases the water quality in the pool. The pool water has more shine, is clearer and thus also cleaner and more hygienic.