Just because the water is clear doesn’t mean that it is clean. According to Buildipedia.com, swimming pool water needs to be checked at least twice or thrice a week to make sure there is no harmful chemical build-up. In fact, swimming pool water should have pH levels that are close to neutral, allowing only for a slight imbalance due to the presence of chlorine, which makes the water a little acidic. Speaking of chemicals, you should also be wary about how much cleaning agent you add to the pool. Chlorine levels should not exceed 3 ppm. Adding enough cleaning agent to the pool, however, is also necessary, especially after putting on a fresh supply of water topping up the pool after evaporation.
http://poolshopwa.com/News/1025/Perth-Pool-Equipment-What-You-Need-to-Keep-Pools-Clean-and-Sanitized
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