 It will be around 9.0 in a salt-water pool.No matter which form of soluble boron is added, within the acceptable range of pH and boron concentration for swimming pools, boric acid is the predominant form in aqueous solution, as shown in the accompanying figure.The boric acid - borate system can be useful as a primary buffer system (substituting for the bicarbonate system with p"K" = 6.0 and p"K" = 9.4 under typical salt-water pool conditions) in pools with salt-water chlorine generators that tend to show upward drift in pH from a working range of pH 7.5 - 8.2.