... Plus,Water hardness Features:Hardness Increaser is used to raise the calcium hardness level in the pool to the ideal range. Prevents ... new repacking styles. Size:0.5kg (or 1lb),1kg (or 2lb),2kg (or 5lb),3kg,4kg (or 10lb),8kg and 10kg of Pillow Bags ... , Doy Packs,Gusseted Bags.0.5kg (or 1lb), 1kg (or 2lb), 2kg (or 5lb), 3kg, 4kg (or 10lb), 8kg and 10kg of Pails, Jars ...