New SWG and 300 CYA problem

Newbie here from 112 degree Phoenix.
I have had a clorine pool and have been proud of the condition I kept it in.
Just had a topline SWG installed. They added 120lbs pool salt. The "purple stuff" and an algecide.
The problem is that I now have CYA at 300.
Any ideas on what caused this?
Is it dangerous?
What should I do?
Regards
Mark

User name Reggie was my dog. He died of old age and doesn't mind me using his name.

How are you determining the CYA is 300? Melamine precipitation tests for CYA are not accurate above 100 ppm unless the sample is diluted. If the test was done with a test strip they cannot be trusted to give a precise reading. Get the water tested with a liquid test for CYA.

Thanks for the guidance Evan. I will take it in for testing.
Mark

as an aside, what size pool do you have? unless you have a really small pool, 120 lbs of salt sounds low

Quote:

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Originally Posted by SoCalBoo

as an aside, what size pool do you have? unless you have a really small pool, 120 lbs of salt sounds low

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14k

checked it today at 3650ppm. They had recomended 3500.

3 x 40lb of Leslie pool salt.

Mark

Mark: When you get your CYA numbers back from testing, could you also post how you chlorinated your pool prior to installing the SWG?

Sandy