Blue Horizons Ultimate Multifunctional Floating Dispenser 1500g is perfect for large above ground pools or in-ground swimming pools. Specifically recommended for pools between 5,000 gallons (22,700 litres) and 15,000 gallons (68,175 litres). As a guide, an 18ft round pool that is 48 inches deep contains 4661 Gallons (21,182 litres). The dispenser comes fully loaded with chlorine - so there is no need to touch any chemicals in the process, simply place into your swimming pool and let the dispenser do the work! Comes loaded with: - Sanitiser (Chlorine), to keep the water disinfected from bacteria. - Clarifier, to keep the water sparkling clean and improve water clarity. - Algaecide, to prevent algae in the long term, alongside the sanitiser. - Sun Stabiliser, to protect sanitiser (chlorine) levels from the sun. Feactures - Blue Horizons Fully Loaded Floating Chlorine Dispenser 1.5kg for Swimming Pools - Recommended for pools between 5,000 gallons (22,700 litres) and 15,000 ga