How much diclor equates to "stabilizer" in the pool math calculator?

[tomdav]

Hi, just re-filled my 375 gallon hot tub and not sure how much diclor to add to get to 30 ppm CYA. The pool math calculator indicates I should to add 1.6 oz (volume) of "stabilizer" but not sure if "stabilizer" is CYA or diclor? I'm using Clorox xtra blue shock which the label indicates is 72% diclor. Assuming diclor has 9 CYA / 19 diclor, should I be adding...

(a) 1.6 oz CYA x (19 diclor / 9 CYA) x (100 shock / 72 diclor) = 5.7 oz shock?

or

(b) 1.6oz diclor x 100 shock / 72 diclor = 2.2 oz shock?

or

(c) some other forumula?

FWIW, I measuered my shock both by weight and volume and it seems weight and volume are pretty close, so not worried about that aspect, just not sure how to translate "stabilizer" to shock.

 

[mknauss]

Stabilizer and dichlor are different items. Stabilizer is pure Cyanuric Acid. Dichlor is approx 50% Cyanuric Acid.

 

[tomdav]

OK, sounds like formula (a) above would be correct. Just trying to figure out how much Dichlor shock to set aside before switching to liquid bleach per the Dichlor/Bleach method. I don't really want to test CYA levels, seems easier to just measure Dichlor shock in advance and stop using it once the pre-measured amount has been used up.

 

[Gebo]

Help me understand. How many oz of Dichlor does it take to get to 30 ppm CYA? Getting ready to do my 4 month purge. I’m adding the Dichlor to get my CYA to 30 and then switching to 10% bleach.

 

[wireform]

I'm using Clorox xtra blue shock

You probably want to stop using this product and any other "extra blue" =copper and staining.