CYA increased with sodium dichloro

[dtbcbarber]

I am learning from this site how to keep my pool balanced. We had a really bad algae boom within 2 days pool went green. Bought green out from Leslie’s and it blued up but was cloudy. Thats when I found this site. Even though it was blue, green algae formed overnight. I scrub vacuum same thing next day. So I read all through the site and decided to SLAM and did that. Pool is crystal again but my CYA jumped to 150 from using the dichloro shock I had. I know I’m going to have to drain some water, but I don’t understand why it went so high. I thought it would not add CYA. Any help would be appreciated. I will be switching to liquid chlorine in future and have got the Taylor test kit ordered. Currently use Leslie’s home accublue test. Thank you and Happy Independence Day!
Dawn

 

[Newdude]

Hey Dawn and Welcome !!!!

I know I’m going to have to drain some water, but I don’t understand why it went so high. I thought it would not add CYA

Chlorine is a gas. For pools it's stabilized with water (bleach), CYA (trichlor/dichlor) or Calcium (cal-hypo). We prefer only using bleach/ liquid chlorine because every pool in the land can accept of a gallon of water each day, but the other 2 forms will jack those levels.