Stains

Stains on the pool surfaces, pool equipment
or on the swimmers, or off-color swimming pool
water. Discolored but clear pool water.
hess12

Stains

Postby hess12 » Sun 08 Mar, 2009 18:55

about a year after our pool was put in, we began to get black stains in the deep end of the pool, so we had it drained and acid washed. a year later they came back and are now all over the pool. we don't know what causes them,we have had many experts out to look at it and have had many different opinions. some say that it is water leaking from the ground into the pool, and others say that it is to copper wire from the heat pump. any help or ideas would be great.


Me...
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Stains

Postby Me... » Sun 08 Mar, 2009 19:27

How do you chlorinate? To what level? Where are the return fittings and how many are there? Do you have a main drain?
hess12

Stains

Postby hess12 » Sun 08 Mar, 2009 20:29

we have a salt system pool for chlorination.
we have main drains
we have a heat pump for heat
Me...
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Stains

Postby Me... » Mon 09 Mar, 2009 00:21

Ok, what PPM do you keep your chlorine level at?

You must also have a skimmer or 2 but how many places does water reenter the pool? Are they wall fittings or floor fittings and how many are there?

Another question to shed light would be fill water. Is it a well? Have you had your tap/fill water tested for metals or minerals?
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Larry
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My Pool: Inground concrete 72m2
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Stains

Postby Larry » Mon 09 Mar, 2009 01:11

Some more clarification:

Are the stains small spots or large irregular "shadows"?

Do the stains spread or do they develop independently?

Have you determined whether the stains are organic or mineral? Chlorine destroys organic stains. Acid can destroy mineral stains. Have you tried the "sock test"?
hess12

Stains

Postby hess12 » Mon 09 Mar, 2009 14:08

I am not on well water and have had my water tested it is ok.
I have a self cleaning pool with pop up heads on the bottom.
Have a main drain in the deep end.
Stains are black irregular and all over.
I have been told by one source that it is my heat pump, the copper tubes are leaching on to the pool surface. Acid does take it off.
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Larry
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Posts: 371
Joined: Thu 09 Dec, 2004 20:19
My Pool: Inground concrete 72m2
Tiled overflow pool
2 Hp pump mono
Fiberglass sand filter 920mm
Tiled deck

Stains

Postby Larry » Mon 09 Mar, 2009 16:13

OK. So it's a mineral (metal) stain.

If the cause is copper, the water can be tested easily and cheaply.

If not copper, then it may be iron or manganese. Manganese in particular can be carried downwind of a factory or processing plant, and very small quantities can wreak havoc in a pool.

Larry

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