Chlorine, an anti algae containing a flocculant. Tablets of 20 g or 200 g. Application: one tablet for 15-20 m3 of water in the pool every 5-7 days. This product is added via a skimmer or dosing device. The dosage of chemicals is just a recommendation, it can vary in each case depending on the weather, pool operation, etc. Before adjusting the pH from 7.2 to 7.6, the active chlorine level should be between 0.5 and 2 mg / l.