Low alkalinity Help please!

[Pauline]

Hi Can anyone help please. We have a 15ft x 4ft pool (approx 4500 gal)and PH and chlorine levels are perfect and have been for a month, but, since filling pool I cannot get alkalinity up It is between 0 and 40. Can anyone advise me on how to increase this. I have looked at a couple of websites and they mention bicarbonate, does this mean bicarbonate of soda and how much should I use, and, do I put it straight in of dilute it. Any help would be appreciated. Thank you Pauline

[chem geek]

You can use The Pool Calculator to figure out how much sodium bicarbonate to add. You can just use Arm & Hammer Baking Soda which may be less expensive than the Alkalinity Up from a pool store even though they are the identical chemical.

[Pauline]

Many thanks for replying. Will take a look at pool calculator. Pauline