After the algaecide is added, you should wait 15 to 20 minutes before going in. Be sure to test your water for chlorine and pH levels, so your pool or spa will be safe and comfortable for your users. Kem-Tek algaecides are not toxic to humans.
The Recommended Daily Allowance (RDA) of magnesium for young adults is around 400 mg/day for men and 310 mg/day for women. For adults over 30, the RDA is 420 mg/day for men and 320 mg/day for women.
Iron Requirements. Adult women between the ages of 19 and 50 need 18 mg of iron each day, and men the same age require 8 mg, according to the recommendations of the Institute of Medicine's Food and Nutrition Board. The recommendation for both men and women 51 or older is only 8 mg.