I have an inground vinyl lined pool. 10,000
These are my numbers
I shocked last night because I had some algae..
With my test kit I'm pretty much guessing at the chlorine after dilution 10ppm Free & total look the same - hard to tell.
TA is 120
PH is just under 7.5
Calcium changed from pink to clear around 600 but never turned blue.
The water looks clear and beautiful.
I have these tea stains on the liner. I've tried the asorbic acid in a pantyhose overnight - nothin'
I tried the Mr.Clean Magic Eraser-nothin' I only succeeded in removing a little ink from the liner.
They aren't just on one side of the pool or the other.
One thing I have noticed is that they buddy up! Like, they're afraid to be alone or something. Where there's one, there's another.. two or three together.
As you can see from the photos, they're very light but when the pool is clear and still I can see them and it makes me nuts.
They started appearing last year- one area ..then another. I always thought I could put a little Vit C or use the eraser on them and didn't need to worry about it. Now that I've done those things- I'm worrying about it.
Oh, I also have a heater that I don't use. It's only about two years old.