Item name AND Location. DIY dosing chemicals - Fourways Shipping or Collection or Both? Can collect Price R10p/kg or R250 for all Full description. Have calcium chloride Dihydrate and Magnesium Chloride Hexahydrate for Randy Holmes Farley dosing. Extremely cheap way of dosing for large systems. Have 13kg of calcium chloride and 16kg of Magnesium Chloride. R10 per kg or take all for R250 including the buckets they are in. Photos of actual Items for sale.