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Calcium Hardness |
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Calcium hardness (or total hardness) is the measure of how hard or soft the water is. The level will vary depending on where your water supply comes from, for example in some parts of Scotland the water is very soft and in parts of Kent the water can be very hard. The hardness depends upon the amount of mineral salts (mainly calcium) that are dissolved in the water and the more salts there are the harder the water is.
Problems Associated with Incorrect Calcium Hardness
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Low calcium hardness less than 200mg/l
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High calcium hardness more than 275mg/l
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Corrosive water
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Scale formation
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Etching of surfaces
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Filter calcification
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Staining
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Cloudy water |
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Skin & eye irritation
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Skin & eye irritation
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Foam
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Lower sanitiser effectiveness
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If the calcium hardness of your pool water is less than 200mg/l then it should be increased using Blue Horizons Calcium Hardness Raiser, details of dose rates can be found below:
Blue Horizons Calcium Hardness Raiser Dose Rates Table
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Pool Volume
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To Increase Calcium Hardness By
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Cubic Metres
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Litres
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Gallons
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10mg/l
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25mg/l
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50mg/l
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4.55 M3
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4,545
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1,000
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68g
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170g
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340g
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11.36 M3
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11,364
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2,500
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170g
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425g
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850g
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22.73 M3
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22,727
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5,000
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340g
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850g
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1.70Kg
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45.45 M3
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45,455
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10,000
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680g
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1.70Kg
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3.40Kg
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68.18M3
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68,182
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15,000
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1.02Kg
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2.55Kg
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5.10Kg
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If the calcium hardness of your pool water is greater than 275mg/l then Blue Horizons Stain and Scale Inhibitor should be used. Stain and Scale Inhibitor works by helping the pool water keep the minerals in solution thus preventing them from precipitating out and causing scale deposits. For dosage information please see the table below:
Blue Horizons Stain & Scale Dose Rates Table
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Pool Volume
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Dose Rates
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Cubic Metres
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Litres
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Gallons
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Initial
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Monthly
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4.55 M3
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4,545
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1,000
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100ml
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50ml
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11.36 M3
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11,364
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2,500
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250ml
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125ml
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22.73 M3
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22,727
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5,000
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500ml
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250ml
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45.45 M3
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45,455
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10,000
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1.00Ltr
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500ml
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68.18M3
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68,182
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15,000
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1.50Ltr
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750ml
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