Pure + Simple Purify works in concert with Pure + Simple Activator and Cleanse to maintain clean and dazzling water throughout the season. These 250g, cylindrical sticks are ideal for longer-lasting skimmer feed, auto chlorinators and floaters (in smaller water volumes). 4 kg pail contains 16 sticks. Approx. 16 week supply in 40,000 litres or an 8 week supply in 80,000 litres, when used as part of Pure + Simple System.