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Keep your Calcium Hardness at proper levels at all times to help protect your pool, water, and pool equipment. The Calcium Hardness level in a pool does not increase rapidly, but it is good practice to check the Calcium Hardness every month. Adding 0.5kg of Hardness Plus to 10,000 gallons of water will raise the Calcium Hardness by 10 ppm.
The minimum level of Calcium Hardness is 150 ppm.
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