Help! The grout in my pool is going black!

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11 Aug 2009 00:00 by joanmalaga Star rating in Costa del Sol. 420 posts Send private message

Does anyone know how to treat this problem? It is slowly but surely covering all the grout in the pool and looks terrible.

I tried shocking the pool and also anti algas but nothing seems to work.


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15 Aug 2009 18:03 by stant Star rating in cardiff wales. 48 posts Send private message

you will need to empty the pool and jet wash it  befor you refill the pool

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15 Aug 2009 19:45 by xpatman Star rating. 17 posts Send private message


yes unfort, you need to empty the pool, how ever if you just jet wash it, it will come back you need a special treatment, im very much a specialist in this field, so if you want me to have a look for you then let me know.

hope this helps.

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16 Aug 2009 08:00 by mr.kevin Star rating in Costa Blanca. 189 posts Send private message

mr.kevin´s avatar

Before you go to the expensive step of draining your pool.  

Take about a 5 litre water bottle, rinse it well in the pool water , fill it right to the top, then take it to a reputable pool shop, explain to them what the problem is and take their advise first.

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16 Aug 2009 10:38 by GEC Star rating. 2 posts Send private message


This problem has been particulary bad this year, we have had a few pools wih the same problem, one of the main causes has been palm trees near to pools that have flowered this year.  We had to give the pools very high dosages of chlorine granules and allowed it to settle on the bottom of the pool allow to start to disolve  allow to settle on bottom of pool covering effected areas and then use the brush to scrub the tiles and grout. Continue brushing the effected area for a couple of days, you should see a marked difference within 24 hours. The downside is you cannot use the pool for a number of days until the chlorine level is back to a safe reading, however this is far less expensive than changing the pool water.  If you do have palms that have flowered in your garden remove the the flowering stems. To help keep the problem at bay keep the chlorine level to the highest safe reading.

If you intend to go along the unnecessary route of draining the pool please be aware if you do use a jet washer it is very likely that the grout will be removed also therefore adding more expence for you. So far we have managed to cure 100% of pools with this problem by using the above method,  now all pools are back in use and chemical levels back to safe reading and no more mould has appeared !



This message was last edited by GEC on 16/08/2009.

This message was last edited by GEC on 16/08/2009.

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