Long-lasting chlorine JOKER - 1kg, slow chlorine stabilizes the effect of UV on the water of your pool and prevent the proliferation of bacteria. For clear and crystal clear water all summer! Advantages: A single treatment to disinfect the water of your pool Easy dosing with a 200g roller pack Characteristics: Recommended dosage: 1 roll per week for a 20m3 basin Disinfectant Rollers: 200g Weight: 1kg Packaging: Comes in its packing Original Caution: Use pool care products with care. Before use, read the label and product information.