1.5kg Chlorsave granules.
Chlor Save (cyanuric acid) is a stabiliser which is added to pool water to slow the rate at which free chlorine is destroyed by sunlight. A properly stabilised pool will reduce it`s chlorine consumption by up to 50%.
Chorsave also comes in 3kg granules and in 200gram tablets in the following quantities:
5 x 200gram tablets (1kg)
10 x 200gram tablets (2kg)
20 x 200gram tablets (4kg)