Maintain recommended daily levels of 3.0 to 5.0 ppm. Heavy spa use and higher temperatures may require higher usage rates to maintain proper bromine residue. Daily use should be approximately 5 g of SpaGuard Hot Tub Sanitizer Tablets per 1000 L of spa water. The weight of SpaGuard disinfectant tablets is approximately 20 g. For good hygiene, the spa should be completely drained periodically.