Dogs have amazing senses, a dog will not drink polluted water, they can sense what is drinkable and what is not - let him/her do it's thing.
We are on a well, a couple of times a year (spring rain and fall rain) we pick up surface runoff in our well and this will lead to bacteria such as e.coli.
For us, this is not a problem since we do not drink the water, just use it to shower and such, however, the dog drinks the water regularly, BUT, I have noticed that during those times, he turns up his nose at it and goes and drinks from the creek or a puddle.
I never need to test my well water, I just watch the dog.
You have nothing to worry about with the dog drinking the pool water - just watch it when you shock, but I bet the dog won't go near it over that time.
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