Hi all, TFP's been great for my water, but the plaster is not looking so good. I have two different stain types that seem to be growing. One is over a wide area of the pool, and is kind of a light tan. The other is a very dark stain showing up in small spots. Any assistance in suggesting additional tests or opinions as to what to do next for treatment would be great. I have read a bunch of posts here at TFP, but not really sure which direction to go.
I've tried identification testing with trichlor pucks, hydrochloric acid poured down a pipe, and ascorbic acid. No definitive results from any of them. Maybe just a bit of a response to the AA after an hour or so, and particularly on the darker stain. I took the pic's below when I tried the AA.
This one just after I put some vitamin C tabs on the stain.
The darker stain.
A close up.
An hour later.
The dark one later.
FC 4 ppm
CC 0 ppm
TA 50 ppm
CYA 30 ppm
CH 875 ppm
Borates I've added 2 boxes of borax but then decided to stop until I got the stain under control in case I needed to change a bunch of water.
There was a time when I first got the pool (older pool, got it with the house) that the pH was quite high and that may have started the staining. No heater so not sure where metals might be coming from. I had a bunch of palm tree "berries" to clean out of the pool when I first was converting from a green swamp.
All I've been doing to combat this is trying to keep the pH in the low 7's in case it is calcium.