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.
The conservative rule is to test after an hour, but in a pool with good circulation most of the chlorine is disbursed in around 10 minutes and the chlorine level doesn't change after around 20 minutes. I've done this sort of test in my own 16,000 gallon pool with 3 returns, one skimmer and two floor drains.