Your CYA is likely higher, but that is about as high as a Pool Store test machine can go.

You need to get your own test kit. Taylor K-2006C or TFT Test Kits

Test Kits Compared

We cannot do much with pool store tests as they are too inaccurate.

 
Started to drain pool to dilute it but this it what my plaster looks like. Can it be from the high levels
You need to get your water chemistry under control, then you can work on stains in your pool...

 
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Your CYA is likely higher, but that is about as high as a Pool Store test machine can go.

You need to get your own test kit. Taylor K-2006C or TFT Test Kits

Test Kits Compared

We cannot do much with pool store tests as they are too inaccurate.

Could that be why it looks like that
 
You need a proper test kit. I suggest the TF-100/Pro or Taylor K2006C. A proper test kit is needed to get the accurate water chemistry results needed to follow the TFP protocols.

Once you get your test kit, run a full set of tests and post them here.

Plaster erosion is normally due to low CH, low TA, low pH, and / or the use of granulated acidic products in the area of erosion.
 
Are you just going to keep posting the same problem every year and ignore the advice?

We are wasting our time if you are not going to get a good test kit and begin to follow the recommendations.

 

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Not from high CYA.

Could be organic from lack of chlorine or metals staining.
Is that considered etching? Can it be fixed with balancing the chemicals. It feels like it needs to be sanded
Are you just going to keep posting the same problem every year and ignore the advice?

We are wasting our time if you are not going to get a good test kit and begin to follow the recommendations.

wow! Pretty friggin rude
 
Sorry, not trying to be rude, but you keep ignoring the advice that people give and keep posting the same issue.

People are genuinely trying to help, but we can't if you don't want to provide the necessary information.
 
You are asking us to diagnose the plaster problem with no reliable chemistry information.

Not really a realistic expectation.

If you had just joined, that would be a completely different story.

However, after 7 years and multiple recommendations to get a good test kit, you should be well aware of how important good test results are.
 
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Some of the spots look like what is referred to as "spot etching", which is generally attributed to the quality of the plaster product or application by some people, but there are some people who blame it on the chemistry.

We would need reliable data on the chemistry from the initial fill to now to really be able to assess what caused the problem.

As far as I can tell, the chemistry is not maintained properly or regularly.

It looks like some copper stains, which can come from a heater corroding from bad chemistry or maybe algaecide or maybe mineral systems.
 

 

 
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