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 3″ Tabs $60.50 Add to cart Salt 40lb $14.50 Add to cart Calcium $8.75 Add to cart Stabilizer $8.50