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London Swimming Pool Company
Unit 1, Shannon Commercial Centre
Beverley Way, New Malden, KT3 4PT
Tel 020 8605 1255

Registered in England No: 07274168
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Blog

06 November 2014
Does your pool have white deposits?

If you notice white deposits on your tiles, this is most likely an excess build up of calcium, usually the result of high pH level, high alkalinity level or high level of calcium in the water.   Calcium deposits are often due to hard water, but external factors such as changes in temperature or water evaporation can alter the chemical composition of the water, resulting in deposits. 

While calcium deposits pose no risk to swimmers, they look unsightly and can be damaging to the pool’s filtration equipment and the longer they are left untreated the harder it is to remove the deposits. So, it’s important to take action immediately any build up becomes visible to avoid the deposits penetrating the tiles and becoming more difficult to eradicate.

Prevention
To tackle the problem at its root cause, ensure that your pool's calcium levels stay below 350 ppm (mg/l). Likewise, the water's pH and alkalinity levels must be within acceptable parameters. Healthy pool pH levels are typically between 7.4 and 7.6 and alkalinity levels should be between 80 and 120 ppm.  If you're not sure how to test your pools pH, alkalinity and calcium levels, contact your local professional.

Regular Servicing
The next step to prevent the occurrence of calcium deposits on your pool tiles is to be diligent with maintenance. Your regular service engineer will spot any early signs of deposits and remove these.  But if you prefer to keep on top of it yourself, you should scrub the pool tiles with a scale removal product on a regular basis, this will avoid calcium deposits from building up in the first place.   

Backwashing
Provided you aren't living in an area with hard water, regularly backwashing your pool at the filter can bring an influx of fresh water into your pool which will restore the composition of calcium to more appropriate levels, helping you to avoid problems.

Heavy Deposits
If you do live in an area where calcium deposits are inevitable and calcium has built up on the tiles over time, the wisest course of action is to speak with your service engineer – your pool may need specialist treatment, such as an acid wash, which requires the skills of a professional to ensure it is done safely and effectively; restoring your tiles to their former beauty.

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