AGP with calcium deposits on liner?

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S1ngram

S1ngram

Well-known member
Jun 7, 2014
327
St. Bernise, Indiana
A few days ago, I noticed 4 separate sharp tiny white bumps on my pool floor. They were widely scattered across the pool floor. There may be more and I didn't step on them. I felt them while walking around and was able to remove them from my liner by brushing them away with my big toe.

For the past month or longer I have been trying to lower my TA so I can run my SWCG. It takes forever. I need to bring it down to around 80 and last I checked it was 140.

I read in another thread that these little deposits can have something to do with TA and pH. Does this sound like a calcium deposit? What should I do? I have guests coming in a couple days to swim and I don't want any of the adults to hurt their feet. None of the kids can touch so it probably won't be an issue for them.
 
What is your CH?
Have you been having to add a bunch of fill water?
What is the CH of your fill water?
What is the TA of your fill water?

It may be more expeditious to post a full set of test results for both your pool and your fill water.
 
We had 3 1/2" of rain overnight.

Here are my test results from testing just minutes ago.
Pool water
CL 5
CC 0
pH 7.8
TA 100
CH 250 (maybe slightly less)
CYA 20 or less

Fill water
CH 275
TA 170

My CYA is disappearing. In the last month it has gone from 30 to 20 or less. I know I need to add more now and will do that today.
 
With CH and pH both where they are (and could have been higher) the likelihood of it being calcium scaling is pretty good. I'd drop the pH down to 7.2 and hold it there for a while and see if the scaling goes away.
 
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