adjust cya before or after shocking

[BigDave]

I would go after the algae first and then raise the CYA after you're done, it should take less bleach to get to your shock level with a lower CYA. If dichlor shock is cheap in your area, you may consider using it to start your algae battle - it will add CYA as well as chlorine. Be sure to watch your CYA and pH if you do.

[Kateyru]

Will do, thanks!

[Kateyru]

Okay, I added dichlor last night. I tested ph this morning and it is way up...at least 8.2 (as high as my kit goes). I thought dichlor would lower the ph??? Should I add muriatic acid this morning?
Thanks.

[Watermom]

What is your chlorine level? If you test pH when they chlorine level is high, you can get false pH readings.

[Kateyru]

at least 10, it doesn't look much darker than that

[BigDave]

10? What are you using to measure chlorine? What kit? How much dichlor did you put in? Do you know how many gallons your pool is?

[Kateyru]

I am using Leslie Basic Poolcare OTO test kit (made by Taylor). I misread, chlorine is 5 but that's the highest on the kit. I added 37 oz. of dichlor. Pool is about 22,000 gallons. thanks!