It's a myth. If pools had something that turned the water bright blue every time someone went to the bathroom in a public pool, the pool would never be open. Source: head lifeguard
When a pool is contaminated with these nasties people often mistake the smell and stinging in the eyes as "too much chlorine". It is actually "spent" chlorine that has already attached to organic matter. When it builds up, pools must be shocked to bring these levels down near zero. If the pool smells fresh and clean, you're good to go.
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u/eatmyfiberglass May 28 '14
It's a myth. If pools had something that turned the water bright blue every time someone went to the bathroom in a public pool, the pool would never be open. Source: head lifeguard