Trying to raise ph adding 20 mule team borax

[BigDave]

Melanie,
How's your chlorine(does it keep dropping), CYA, and TA levels? How big's (gallons) your pool?
You could try mixing pool water and tap water at 1:1, 1:2, 1:4 ... until you get a clear reading to see if your pool water increases or decreases your tap water's PH.