Relax Hot Tub Hardness Plus 1kg

Relax Spa Hot Tub Hardness Plus – 1kg – Rapid dissolving granules to increase the hardness levels in your hot tub.
Your Spa needs to contain a Calcium hardness of between 200 parts per million (ppm) and 300ppm. Low Calcium levels (soft water) will cause expensive damage to your spa equipment. This is particularly important if your tap water is soft water (low in Calcium