Coupon code applied successfully : Free shipping on orders over $50 View cart “Alkalinity Increaser” has been added to your cart. 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 Calcium $8.75 Add to cart PH Plus $3.75 Add to cart Carboy Shock $25.00 Add to cart Salt 40lb $14.50