Convenient liquid Spa Down offers precise control of the adjustment of the spa or hot tub pH level. Pre-mixed liquid formula arrives ready to use and does not require mixing or diluting before adding to the spa or hot tub. Fast acting liquid formula is easier to use than common granular spa water balancers. Compatible with bromine chlorine and biguanide sanitizers. Instructions - Turn ON air blower or filter system. Add 1-ounce directly into spa. Retest water after 30 minutes. Follow steps 1-3 until pH and total alkalinity are in the range of 7.2-7.8 and 80-120 ppm respectively. Features . Decreases pH. Compatible with chlorine bromine ozone and biguanides. Solution requires no diluting. Spa Down - Liquid Lowers pH no premixing. Capacity - 1 Quart. Dimension - 3 x 3 x 10 in.