Sani Marc Summer Smiles 30-07065-80 8x100g Alg Out Ultra 3 in 1 destroys and prevents the formation of algae in pool water. This innovative algaecide comes in a long-lasting pre-dosed solid format that’s both safe and easy to use and store. ALG OUT ULTRA 3 IN 1 treats a wide variety of algae (green, yellow and black). Once dissolved in water, its unique concentrated formula also improves filtration and helps to maintain water temperature.