250 X TOP QUALITY Multifunctional Chlorine Tablets - 20 GRAMS - 20g EACH. Chlorine tablets for hot tubs. Chlorine Floating Dispenser - For use in Floating Dispenser. Item number: 150240373308. They have a higher pH value, which reduces the amount of pH regulation you need to do and as well as being STABILISED to reduce chlorine loss to sunlight they also contain CLARIFIER and ALGEACIDE to help improve CLARITY and prevent algae formation.
eBay