When did they start using trichlor for shock?

markayash

Gold Supporter
Mar 21, 2016
538
Marrietta Ga
I had a slight yellow algea bloom creeping in and knew my calcium was a little low so went to walmart to but a few bags of shock. Luckily, after learning from here, i checked the ingredients and the cheap stuff wasnt calcuim based but the expensive HTH was which is what i bought :) Use to be all Shock was the same but not anymore. No wonder everybody has a CYA issue
 

kimkats

Mod Squad
LifeTime Supporter
Jul 10, 2012
40,375
Tallahassee, FL
It is either CYA or CH.............both needed for a plaster pool but too much and it is not good...............You did the best thing by reading to see what is in it!!! Plus watch for anything that says BLUE......it almost always has copper in it :shock:
 
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markayash

Gold Supporter
Mar 21, 2016
538
Marrietta Ga
My CYA is around 80 after i dropped it 18” and refilled :( so dont want that for sure.
It said 4 in 1 but wasnt blue so think it was marketing stuff.
 

kimkats

Mod Squad
LifeTime Supporter
Jul 10, 2012
40,375
Tallahassee, FL
They will try anyway to get a buyers attention that is for sure! I am SO glad you know the difference and what to look for. With your CYA of 80 you are smart to not add any more. There are so many pool owners that just do not have a clue :(
 
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