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I live in Phoenix, so we've always had high calcium hardness readings. I use Taylor testing reagents. After our yearly spring pool drain, I always bring a sample to Leslie's for comparison. Until a few years ago, Leslie's numbers weren't too far off from mine. But the past three summers...

Wrote you all last fall about my new pool, rising CH, plaster-quartz composite interior. Finally, the end of October, the CH leveled off at 850. I have a kit that's been tested against standards, and I have been consistently getting a reading of 825-850 since the end of October. Fill...

My pool--quartz composite similar to ultrapoz-- is only 3 months old and already has CH of 750--according to the Expert the pool builder sent out. Leslie's had my last reading at 430. Because the pool is new, and the 400+ CH reading, I was already trying (acid almost every day) to keep my ph...