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Thanks for the hint about smoothing the wrinkles! We did have a very strange Spring--no rain for 2 moths then quite a bit of rain, but I am still not entirely convinced that it is subsurface water; there was a water issue when the pool was built; the builder didn't put in a pump, but did...

Thanks, I will try to get a full set of test results and some pictures later today. Last pH readings were ~7.2. I do have an opaque, automatic cover which I use most of the time. John OK: Added an image. Best I could do--this is looking down the slope into the deep end; best place to see the...

As I said in my post, it is an in-ground pool. I am getting soft "blisters" in the liner, maybe 6-8" long, 3-4" wide, pretty evenly distributed about the pool. I will try to post a picture later. they are soft, and give the bottom a "squishy" feel under the toes. I am guessing that water is...

Ok, I'm freaking out. I finally got through my CYA-Ammonia-superchlorination drama on my 16x34 5-year-old inground vinly pool, gotten all the numbers good, pool sparkling, and a couple of days ago I noticed a few bubbles in the liner. Small, low, barely noticeable. Today I looked, and either...

Also, HUGE thanks to both of you--the Pool Calculator is an incredible help, and my TFT test kit has saved me many times. This site is the best! You were the only place that helped me diagnose and solve my ammonia problem the first time it happened (Thanks Chem Geek!) John

Jason- What I meant regarding the ammonia was that if I was not using the tabs for chlorination, I would have no (or low) CYA, and little for the bacteria to convert to ammonia. As for my CYA level, I NEVER get a reading above zero on test strips, and using the test kit in my testing set (the...

Hi all! This is my 5th season with my pool; it's a 16x34 in-ground, vinyl lined pool, with a coverstar automatic cover. I have an in-line chlorine feeder that uses 3" trichlor tabs, and a hayward cartridge filter. The first year, the pool was a dream--it used almost no chlorine; I maintained...