Had a friend buy a house with a pool and he asked me to show him how to test and balance the water. I take my trusty tfp 100 test kit and find his CYA is over 100 - about 120. I tell him ita too high and how to lower it. He calls his pool guy who tells him it's fine as long as its under 150. Is that a commonly held belief in the pool community? I've never even heard this before so I was shocked. I think he believes the pool guy since the previous owner told him he never had an algae problem in 7 years he lived there. Just curious
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