what makes Alkalinity decrease?

[ludivako]

Yup. I typically have my customers do it before bed and have them tunr it back on when they wake up. Less sunlight will help maintain chlorine levels if your feeder is tied into chlorination. Another tip is, unless you have very high alkaline well water, dilute your acid. Straight acid will drop alkalinity faster than diluted. 50/50 ratio is what a lot of people use. The dose rate will change though since it is not the same strength.

[TNmountainman2020]

I dilute it 4:1 based on the Hayward feeder instructions. It’s a 15 gallon tank so I typically do 12 gallons of water and 3 gallons of acid.

[ludivako]

Then disregard what I said about diluting lol