Stubborn White Spots

[buckslivin]

Hi TFP forum -

After many years of smooth maintenance (thanks to this site), I am getting an accelerated amount of white spots in my pool. Some are linear, some are amoeba shape.

I have tried scrubbing with a wired brush, brought my PH done to 7.2 and scrubbed again but nothing seems to be working. Any obvious steps I am missing, latest test and pics below. Thank you!

FC: 2.82
CC: 0
PH: 7.4
TA: 95
CH: 363
CYA: 51

 

[Texas Splash]

Hello! I'd have to ask someone with a keen eye for plaster like @onBalance for some help. What does catch my attention however are those test results. Those aren't from the TF-100 you have listed in your signature. Do you have any of those TF-100 results by chance? The pool looks like it was re-plastered in 2014, so about how long ago would you say those spots started to occur?

 

[onBalance]

Reading the post below will explain what is going on with your plaster surface.

Calcium Nodules in pools

What are calcium nodules? In swimming pools and spas, they are small mounds, bumps, deposits, or “slag” piles of calcium carbonate which are formed from material that has been released from the plaster. The small calcium nodules are rough to the touch, hard, and generally gritty. Nodules may...

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