Multi function chlorine disinfecting tablets for swimming pools : They are highly concentrated and make permanent chlorination of the pool possible. Actions: 1. disinfectant 2. clarification 3. floculant 4. algicide 5. chlorine stabiliser. Instruction for use and recommended dosage. Pool maintenance: 1 block for 40-50 m3 each week. The block of chlorine JD Action 5 carries out chlorination for 5 to 7 days. Place the block in the skimmer basket of the pool or in a chlorine dispenser. The dosages given are approximate. It is advisable to check the pool chemical levels. The pH should be kept between 7.0 and 7.4. The chlorine level should be between 0.5 and 1.5 ppm (mg/l). Please note this product contains stabiliser.