PoolSan pH Minus pH reducer and alkalinity reducer 1200gr for pools & hot tubs\nPoolSan pH Minus granules, pH reducer/decreaser and alkalinity reducer in three handy resealable 400 gram sachets to ensure that the product is always fresh as it absorbs moisture from the air and loses a little of it\u2019s potency every time the container is opened When Pool or Hot tub pH or alkalinity is too high it can be detrimental to disinfection, pool equipment and bather comfort. We recommended that you first get the total alkalinity (TA) of your pool or spa correct, which will then allow you to set the pH and disinfectant levels much more easily. Full instructions are on the label. Feel free to contact us by using the messaging app below if you need any advice or you would like us to guide you through the process of using our products. When using this product to reduce total alkalinity (TA) add your dose to the pool without the filter running so it settles at the bottom of the pool, then resy