10KG PH Increaser ( PH+). PH Plus is also used to increase the Total Alkalinity of your Spa, Hot Tub or pool water. Why Happy Hot Tubs?. We have over 30 Years experience in Hot Tubs and Pools! Use this high quality PH Plus to Increase the PH value of the water in your spa (7.2 to 7.6 is the optimum for spas).
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