With added algaecide, pre-measured slow dissolving tablets for use in floating tablet dispensers, inline tablet feeders or added directly to skimmer box. Keeps water safe from viruses and bacteria. In-built UV protection for longer life in outdoor pools. Ideal for once a week dosing or as a chlorine boost for salt pools. Used to control algae and bacteria while increasing the longevity of chlorine. Contains an algaecide for long lasting protection against algae with minimal effort through winter and summer and is also suitable for use as part of a regular maintenance program.