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£11.76
Your Pool Or Spa Water Needs To Have A Calcium Hardness Level Of Between 200ppm (mg/l) And 300ppm
Water With A Lower calcium Level (Soft Water) Is Likely To Damage your Pool Equipment.
To Increase The Calcium Hardness By 10ppm Add 15gm Of Hardness Plus Per 1,000 Litre Pool Water. (700gm Per 10,000 Gallons Of Pool Water)
