Adjusting pH in the winter

[jhk49]

I live in south Georgia. My 25000 gallon outdoor liner pool water is presently at 58F degrees. My water comes from a well. My pH at present is 8.0 and my total alkalinity is 125 .... these were obtained using a Taylor test kit.

Based on acid demand (2 drops) and table E, it says I need to add 46 fl. oz of Muriatic acid (31.45% HCI).

Do you all agree with this?

[BigDave]

I presume you're not swimming.
Is your circulation system connected and operating? It might be a bad idea to put acid into water that's not mixing well.

[jhk49]

Yes, the circulation system is working fine. I run it about 8 hours per day. Also, for what it is worth, I have recently noticed some algae growth for which I added an algaecide as well as bringing my chlorine levels back up.

Jim K.

[Watermom]

Might be a good idea to post a complete set of current water testing results. Glad to see you back around the forum!

[jhk49]

OK, as stated previously, I live in south Georgia. I have a 25000 gallon outdoor liner pool. I use well water. The water sample indicates the following: FC 0.2, CC 1.0, pH 7.9, ALK 125, CYA 65 and water temp 57 degrees F. Based on acid demand (2 drops) and table E from the Taylor test kit, it says I need to add 46 fl. oz of Muriatic acid (31.45% HCI).

Do you all agree with this?

My circulation system is working fine and I run it about 8 hours per day. I will be adding bleach to get me chlorine levels back up. I am starting to get some algae growth. We are not swimming yet.

Thanks for any help.

[Watermom]

If it were my pool, I wouldn't worry about pH of 7.9 until I was ready to open the pool but if you decide to go ahead and lower it some, I'd start with a smaller dose. Maybe about 20 oz. But, don't worry about measuring it exactly.

Please read about using muriatic acid safely in the following link.
Using Muriatic Acid Safely

[BigDave]

You'll probably need more FC to keep the algae down.

[Watermom]

He'll definitely need more FC. Check the Best Guess Chlorine Chart in my signature below (which isn't really a guess!) for the connection between chlorine and CYA levels.