I have to go to pool store to buy my "liquid chlorine" (as they love to call it, a/k/a 10.5% bleach) as it's the best deal in town money-wise. He keeps trying to get me to bring in a water sample to test for phosphates "because they consume chlorine which is probably why you are using so much of it." I keep telling him "I'm not worried about phosphates. They're just food for algae.", whereupon he keeps repeating himself. How may I politely get him to be quiet and realize that phosphates are just food for algae and that they do not cause my FC level to decrease? What polite arguments may I use? (I'm about to lose my patience with him and tell him to be quiet, but that would be rude.)
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