PH level decreases

[Maxumman]

I have a fiberglass 8400 gallon pool. Just opened it and have reached the blue cloudy stage. However, the PH level is decreasing and I have to add PH increaser to counter. What would cause this? Normal CYA and a little upper reading on the alk about 180. FC at 3.

[Guest]

Are you using chlorine tabs to sanitize? If so, that would be the reason for the pH going down.