Bright Blue Stains on Pebblecrete Surface

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.
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Pool Newbie
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Joined: Mon 10 Sep, 2018 20:23
My Pool: Our pool is approx 4 x 6 meters, 35,000 litre salt-chlorinated, sand filtered pool. It is inground concrete with 'salt and pepper' pebblecrete surfacing.
Location: Sunshine Coast, Queensland, Australia

Bright Blue Stains on Pebblecrete Surface

Postby jayveebee61 » Mon 10 Sep, 2018 20:47

Hi there,

We recently bought our house and with it came an inground concrete pool, with the standard 'salt and pepper' pebblecrete surface. We are guessing the pool is around 16 years old at least.

Our issue is that along the pebblecrete surface of the pool, above and below the waterline - and mainly on the walls - are these bright blue stains. I have attached 3 photos.

I have had the rep from LoChlor out a few time times to look at the pool and we have tried LoChlor "MultiStain" Remover, Lo Chlor "CU Later" copper remover, and ascorbic acid and nothing has budged the stain - even a little. We used these products exactly as directed.

I have also applied a little pool acid (HCl) to one of the stains above the waterline, and scrubbing it with a nylon brush and it actually made the stain worse, resulting in a deeper blue colour.

I asked the previous owner - an old woman - if she knew what caused it and she did not know.

Just thought I would get in touch with you guys to see if you had any suggestions. At first because the staining was blue I though it may have been copper but the "CU Later" did not budge it at all. Also the colour is bright blue - not the blue-green hue of a typical copper stain.

The pool is saltwater chlorinated. At the moment the pool has zero chlorine/salt and pH is neutral as this was what was required to trial all the above products.

Any advice - very greatly appreciated.

Swimming Pool Superstar
Swimming Pool Superstar
Posts: 480
Joined: Tue 17 Oct, 2017 10:52
My Pool: 12 x 24 (45m3) liner pool, Triton TR60 filter with AFM glass media (Activate) and variable speed pump running 0.08HP
Location: UK

Re: Bright Blue Stains on Pebblecrete Surface

Postby Teapot » Tue 11 Sep, 2018 01:37

Now you have tried reducing the stain with acid which would then indicate metals being present. Try a chlorine tablet held directly on the stain for a bit and report back.

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