Adjusting pH in the winter

[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.