500g Relax Spa Hardness Plus
- Your spa water needs to contain a Calcium Hardness of between 200 parts per million (ppm) and 300 ppm
- Low Calcium (soft water) will cause expensive damage to your spa equipment
- This is particularly important if your tap water is soft water (low in Calcium)
- Test the Calcium Hardness immediately after you have drained and refilled your spa water and at least once per week
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