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Hello, I was here last month, trying to get rid of some stains on the walls. I'm still working on those with perpetual scrubbing. But I feel like a key to this solution is to lower my alkanity and calcium hardness. Here are my numbers (Side note - I ran out of bleach yesterday, so my...

Hello, I have the following readings on my cement pool (which I guess would be called "plaster"): FC - 7 ppm (and I did the overnight test and it lost no chlorine) CC - zero CYA - 45 TA - 200 (same as yesterday, after adding 40 ounces of muriatic acid @ 14.5% PH - 7.2 (was 8.2 yesterday) I'm...

Hello, During this winter, I did not put enough chlorine in my pool and when I tested the levels the other day I saw that the free chlorine was zero. I also had some stains (yellowish in color) that I wanted to try to get rid of and they weren't fading with scrubbing. So, I decided to SLAM...

Hello, I'm starting up my pool for this summer. I had it covered and other than some debris, the green and I can't see more than a foot into it. I gathered the following numbers: FC - 0 PH - 8.2 TA - 130 CYA - looks like zero. My question is, should I begin by trying to raise the CYA with...

I have a 4,800 gallon above ground pool (53" x 9' x 18'). Right now I only have the simple test kit. I ordered the more elaborate kit and I'm hoping the six-part test will be here by Thursday (two days from now). Anyway, the chlorine (about 4) and ph (7.6) look fine. But the water is still...