Swimming Pools in France

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Re: Swimming Pools 2018

Hi Pommier,  you'll need to do a couple of tests first so we can see what effects these have before going further.

You need to get hold of some ascorbic acid or a vitamin C tablet.  The brown could either be iron staining or organic staining.  putting the vitamin C tablet or ascorbic acid directly on to the stain and hold it the for a minute or two and on the spot where the tablet was a lighter or even clear patch should result, if it does then it's iron staining.

Holding a chlorine tablet directly on the stain for a minute or two would lighten the mark if it were organic staining.

Please come back with the results 

Passivpool Energy "A++" rated Swimming Pools, the lowest running costs in the Universe.
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Re: Swimming Pools 2018

Oh dear! Neither of them had any effect. What do you suggest?
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Re: Swimming Pools 2018

Repeat the test but leave them on longer, you should get some change.

Passivpool Energy "A++" rated Swimming Pools, the lowest running costs in the Universe.
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Re: Swimming Pools 2018

This may supplement/reinforce the advice already given

https://www.wikihow.com/Diagnose-and-Remove-Any-Swimming-Pool-Stain
لدى فلسطين الحق في الوجود أكثر من إسرائيل
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Re: Swimming Pools 2018

I think we'll need to get someone out as the stain seems unchanged. Many thanks for the advice.
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Re: Swimming Pools 2018

Good luck with that, (getting someone out who knows anything)  The only other thought on this is a pool I worked on last year, that was fibreglass and the blue colour had simply faded over the years and left a sort of opaque light brown/fawn glassfibre colour which now looks unsightly. 



Passivpool Energy "A++" rated Swimming Pools, the lowest running costs in the Universe.
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