PH Minus$4.00 Lowering your pH will also lower your alkalinity. The ideal pH level is between 7.5 and 7.8 ppm. PH Minus quantity Add to cart Category: Pool Chemicals Related products Add to cart Stabilizer $8.50 Add to cart Carboy Shock $25.00 Add to cart Shock $9.00 Add to cart 3″ Tabs $60.50