What is this chemical?

[Mattikuss]

I’m at Walmart right now. Staring at all
These chemicals looking for MA and CYA.

The only thing that seems reasonably close to what I’m trying to accomplish with MA is this (see picture). What is it and why should I not use it? I’m not leaving Walmart until I hear back from you guys.

 

[proavia]

pH Down is dry acid - do NOT use it.
It will increase sulfates in your pool water and thise can harm your SWG, among other things.

Get plain old muriatic acid.

 

[Mattikuss]

pH Down is dry acid - do NOT use it.
It will increase sulfates in your pool water and thise can harm your SWG, among other things.

Get plain old muriatic acid.

That’s the answer I’m looking for, thank you. If I may follow up with a question: does Walmart have MA and what does it look like? We don’t have a huge pool section in Minnesota.

 

[proavia]

Muriatic acid is usually in one gallon jugs or a box with two 1gallon jugs.

Kem-Tek may be a brand name you can find. But any muriatic acid will work.
Chances are you will find it in 31.45% or 14.5%.

A hardware store, HD, Lowes, Menards, TruValue, Ace, whatever should also have it.

Plain muriatic acid - no 'Acid Blu' or other magic potion stuff.