Do not use bleach. Bleach is the household product found at grocery stores used for laundry which is only 5% in strength. Use chlorine which is 12.5%.
The lack of "bleach" or chlorine can and is unsanitary and you can expect far worse if you do not use a sanitizer. The use of a sanitizer keeps the pool water cleaner or more sanitary for humans ( the filter does the cleaning of the water). There are many names for things that you can catch from dirty pool water. The water does not have to be cloudy looking to be unsafe. Clear looking water can be as unsafe as that of the cloudy water. There are long names that most people can not read less understand that are used for : diarrhea, vomiting, infections, lesions, boils etc. These "bugs" can cause short or long term illnesses.
Did you know that if only one "kid" pees in the pool it can destroy all or most of the chlorine. Someone uses a pool with a cut or has bandages on can transmit or receive through the cut or wound various diseases. One infant who poops in the pool can make everyone who uses that pool very sick. It would take days with normal service to the pool water to eventually disappear. The water has to be treated as soon as possible - - keeping swimmers out of the pool until it is deemed safe. And if someone has diarrhea in the pool the pool should be closed down until it can be treated with extremely high doses of chlorine, the filter is dismantled - cleaned with chlorine, and all the Plumbing flushed with chlorine. Even the person who cleans up that mess can and does get sick.
You could also run the risk of litigation if one of those "visiting kids" gets ill and has to go to the hospital for treatment. I could make this page into a document pages long
but then . . . . .
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