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.
How much iron you need. Pregnant women: 27 milligrams (mg) of iron per day. Non-pregnant women: 18 mg. You don't have to get the recommended amount of iron every day. Instead, aim for that amount as an average over the course of a few days or a week.