Chemical buildup in pool?

So this afternoon I was swimming at my health club when the guy came in to test the water. He scooped some up in a container, did the test, and then poured it down the drain. Then he went and used the same container to test from the hot tub without rinsing it first.

I told him that it's probably toxic and he should rinse it first. I've never had my own pool before, but I have aquariums, and the testing kits for that certainly aren’t inert. His response was "if it was toxic I'd be required to wear gloves"

After he left, I went and looked in the maintenance book, which is available for anyone to look in, and what he tested for was PH and BR.

My question is, what chemicals are used to test for those things? How toxic are they? And do they build up in the body?

I'm pretty peeved, because this is a swimming pool after all, and people are bound to get water in their eyes, nose and mouth.

Answer:
i'm not sure about BR. PH is a measure of the acidity of a substance. The scale goes from 1-14 (or thereabouts) a PH of 7 is neutral, which means it isn't acidic.
Anything below 7 is acidic and the smaller the number the more acidic it is. anything above 7 is basic and higher number... more basic.

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Chemical buildup in pool?

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