All and pH

[bethericson]

I have never used muriatic acid to lower pH. My goal is to lower my TA which is at 140. My pH is 7.8.
I have muriatic acid but am curious how to add it. 20500 pool
Thanks

 

[JJ_Tex]

To lower your pH by 0.6, add just under half a gallon of MA (.4 gallon to be exact). Each time you do that it will also lower your TA by 10, which will likely take weeks or months but your TA will get to where you want.
If you are really in a hurry, you can use aeration to speed up your pH rise and shorten the time between acid additions so your TA ultimately gets to where you want it.

To add the MA, just pour directly from the bottle. I try to do mine in the deep end in front of a jet and pour it very slowly so that the acid from the bottle is about the same diameter of a pencil and get the bottle close to the water to reduce the splashing. In the summer I pour standing in my tanning ledge by the deep end. In the winter, I will kneel from the side of the pool and pour.

 

[pjt]

Just pour directly from the bottle into the pool. The important concept is minimizing the handling of MA. Every time it's handled (measuring cup, diluting in a bucket, etc.), you increase the risk of spilling or splashing. The exact amount of MA isn't critical. You can always add more if needed.

Open the bottle over the water. Pour in front of a return with the pump running. The bottle opening should be just above the surface of the water (~1 inch). You can partially submerge the bottle and use its buoyancy to assist. Slowly pour (pencil stream). Keep the bottle over the water when replacing the cap. When the cap is snug, dunk the entire bottle under the water and slowly swish around to remove any MA that may have trickled down the outside of the bottle. When done pouring, use your pool brush to mix the area if desired.