re: Relentless Pool Algae

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WORST ADVICE ever. Why? They test it for free which is cheaper and more accurate than the high end pool testing kit you suggest.

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Pool store testing can be hit or miss. Maybe you have a great one nearby, but the Pinch a Penny near me is horrible when it comes to testing. Their tests cannot be trusted.

For instance, with my kit, I had a CYA level of 60ish. They tested it and it was 60 also (to keep my pool shell warranty, I have to have my water tested by a professional). The next month, they said my CYA was 0, and they said my pH and alkalinity were levels that weren’t possible together (look up pH ceiling and alkalinity).

I explained that my CYA was 60 the month before, and the only way to get to 0 would be to completely drain my pool. I also explained the pH ceiling and asked if they could retest. The next test had my pH and alkalinity levels exactly where I tested it at. But my CYA was still a 0. I kind of laughed and the manager came by. After explaining to him, he tested the CYA and said it was at 100.

I’ve seen them test other people’s water and try to sell them so many chemicals they didn’t need, such as clarifier. They tried to sell me CYA after the first 2 CYA tests and that would have skyrocketed my CYA.

Bottom line, I trust my testing way more than a pool store. My water has always been crystal clear. I’ve only added muriatic acid to bring down pH and baking soda for when I need to raise alkalinity. I check CYA at the beginning of the season and add enough to get to 60. I add salt periodically to stay within limits since I have a SWG pool.

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We have tried everything and can't beat it this year

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This was me last year. Then I read a thread on here and a guy suggested an algaecide with copper sulfate in it. I went got some, added it, and the pool has been crystal clear all summer.

I always bought the cheap stuff and thought they were all the same. Apparently they're not.

Thanks again folks, I appreciate your input.