Mini Disc is a slow dissolving Chlorine tablet, weighing 15 grams / .53 oz each. These discs are designed to fit perfectly into a ‘Floating Dispenser’. The constant contact with the water releases Chlorine Sanitizer 24/7 into the hot tub water which kills bacteria, viruses and pathogens. It also prevents the growth of these harmful organisms in hot tub water. Chlorine Disc has a low pH value of 3.0. Mini Disc has a high Available Chlorine rating of 92%.