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Water Volume Calculation - How to calculate the volume of a swimming pool. Essential to ensure the correct use of swimming pool chemicals.
Langelier Index Calculator. Find out whether your water is scale forming, corrosive or correctly balanced
Swimming Pool and Spa Bath Glossary of terms and definitions
Dose Rates for swimming pool chemicals, Dose Rates for spa bath chemicals
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CALCULATE WATER BALANCE

Once you have measured the various parameters below, you can use this convenient Langelier Saturation Index calculator to determine whether your water is corrosive, scale forming or nicely balanced. If it is corrosive it will try to saturate itself by dissolving the structure of your pool. If it is scale forming it will try to correct its over saturation by precipitating the hard water salts causing cloudy water and eventually deposit scale on pool components.

Test Kit,pH meter,photometer,DPD,phenol red,alkalinity test,calcium hardness test A full range of test kits, tablets, pH meters and photometers are available from our online shop to enable you to carry out these tests

Saturation Index = pH + CF + AF + TF - 12.1

CF is the Calcium Hardness factor. Optimum range 75 to 150 mg/litre.
AF is the Total Alkalinity factor. Optimum range 100 to 150 mg/litre.
TF is the Temperature in Degrees Centigrade. The HSE suggest water temperature between 27 and 29.5 Deg. C.in commercial pools.
pH. Optimum range 7.2 to 7.6.

If the result of this calculation is zero then the water is balanced. If the answer is less than 0 then the water will tend to be corrosive. If it is greater than 0, then it is said to be scale forming. An acceptable range is -0.5 to +0.5. If the result is outside this range, adjustments should be made to the hardness, alkalinity and pH to bring it as close to zero as possible and ideally within the optimum ranges shown above. Be aware however, that whilst the water may be balanced from a corrosion and scaling point of view it does not necessarily mean that it is ideal for sanitiser efficiency and bather comfort.


Total Alkalinity: 
Calcium Hardness: 
Temp. (°C): 
Measured pH: 
Langelier Saturation Index: 

 

 

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Confederate Chemicals Ltd., Mochdre Industrial Estate
Newtown, Powys, SY16 4LE, Wales UK.    Tel: 44 (0) 1686 627158    Fax: 44 (0) 1686 627580

Copyright Confederate Chemicals Limited 2002