Pure + Simple Activator is the first step of the Pure + Simple System. Activator will prepare your water for the Pure + Simple System and set the stage for the ultimate pool water experience. Activator softens the water, giving it a more gentle, comfortable feel. It also contains a unique blend of phosphate removers, natural enzymes and buffers to deliver exceptional water quality, reduced need for sanitizers and shocks and provide ongoing protection against algae growth. For the feel of a salt pool, without the investment of a salt chlorine generator. 4 kg box treats 40,000 litres of pool water.