I apologize, but I currently don't have specific information regarding the applicability of the R399 price for HTH Mineral Soft Chlorine to spas in KZN. However, I do have some great product options for you! For example, the Hth Granular Mineral Soft 8KG is listed for R589, providing excellent quality for your spa needs. Additionally, you might consider the Hth 1 L Sparkle It for R72.8, which can help keep your spa water clear and sparkling. If you're looking for accessories, the Waterproof & Oil-resistant Spa Massage Bed Sheet at R156 is a practical choice for beauty salons. I'm here to assist you with any other queries, so feel free to ask!