PoolSan pH Plus pH increaser 300gr for pools & hot tubs\nPoolSan pH Plus granules, pH increaser in a handy resealable 300 gram sachet 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 low 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. Note: When using active oxygen treatments like PoolSan Regenerator, we advise that you only use this product to increase pH if your total alkalinity is high or in range because this product will \u201Ceat\u201D your acty