8 O Lord, our Lord, how excellent is thy name in all the earth! who hast set thy glory above the heavens.
Click here for the details. In swimming pools, pink slime is caused by improper water & pool maintenance, environment, poor circulation to name a few. There appears to have occurred a dramatic rise in the reported cases of pink slime especially over the past 5 to 10 years. I'll go into more depth with this comment later.
No, you should never swim in the pool while it is being treated with chemicals. These chemicals can be absorbed through your skin while swimming, which can be harmful. Copper-based algaecides, which are used for treating black algae, can cause staining, and can even turn blonde hair green.