Joint pain can be an early symptom of many different diseases. In rheumatoid arthritis, symptoms often develop slowly over a period of weeks or months. Fatigue and stiffness are usually early symptoms. Weight loss and a low-grade fever can also occur. Joint symptoms include: 1  Painful, swollen, tender, stiff joints.
Alkalinity Balance, pH up, pH down, Calcium Balance, Water Stabilizer, and clarifier are all swim-safe chemicals. Wait about 20 minutes, and you are free to swim. We suggest adding algaecide, Super Erace, and shock at night, after everyone is out of the pool. It is safe to swim again the next day.
For other chemicals a 2 hour wait should be fine but for the best water quality, one complete turn-over. Some people say 30 minutes,but I've always error on the side of caution. If you pour muriatic acid in the pool and swim within 10 - 15 minutes you might get a hot spot of acid that can burn you.