Stains On Plaster

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fields
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Stains On Plaster

Postby fields » Thu 26 Aug, 2010 09:04

I just got my pool re-plastered and in about 3 weeks I'm getting this tan stain on the plaster. Any ideas as to what that could be?


floridapooltech
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Stains On Plaster

Postby floridapooltech » Thu 26 Aug, 2010 09:38

fields wrote:I just got my pool re-plastered and in about 3 weeks I'm getting this tan stain on the plaster. Any ideas as to what that could be?



Do you have a heater hooked up to the system? Also, can you post your test results?

pH
TA
CH
CYA
TDS
Metals
FC
CC
Phosphates
Nitrates
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fields
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My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

Postby fields » Thu 26 Aug, 2010 11:35

No, I don't have a heater hooked-up to the pool. The Phosphates were high last week but everything else was good. The chlorine was low after the pool start-up but that is fine now too. I don't remember what the Calcimine hardness was.

Chlorine 5+
Ph 7.2
Total Alkalinityh 80
Cyanuric Acid 40
Phosphates 300
duraleigh
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Stains On Plaster

Postby duraleigh » Thu 26 Aug, 2010 11:46

There is a good chance the stain is organic and high levels of chlorine will clear it up.....although it may take a few days. It's a cheap fix, if it works, and easy to do.

Simply elevate your Chlorine to about 8-10ppm and HOLD IT THERE constantly for the next few days. If the stain is organic, it will start to lighten. If it does, hold the chlorine up there until it disappears.

Brushing it often (like once each day) is very helpful, too. Even if it doesn't apperar to be removing it.

If the chlorine has no effect over a few days, post back and we'll try another non-organic approach.
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fields
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My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

Postby fields » Fri 27 Aug, 2010 09:57

Thank you, I'll give it a try, then let you know.
Dennis Curatolo florida swimming pool resurfacing

Stains On Plaster

Postby Dennis Curatolo florida swimming pool resurfacing » Sun 29 Aug, 2010 13:40

You can pour muriatic on steps thru the water, The acid is heavier that the water and will find its way down. please be carefull as the acid could splash a drop as your are pouring and possibly get you in the eyes. Wear goggles and hold your breath as well until the little mist of acid clears. If this is iron staining it should go away quickly.
fields
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My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

Postby fields » Mon 30 Aug, 2010 08:48

I did that and the stain did go away. So how do I do the entire surface of the pool with muratic acid? Would Ascorbic acid achieve the same results?

Thanks!
fields
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My Pool: gunite pool - clorine - 13,000 gal
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Stains On Plaster

Postby fields » Mon 30 Aug, 2010 10:22

hey duraleigh, i'm still waiting to see what raising my chlorine will do to the stains. i started that on saturday.
duraleigh
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Stains On Plaster

Postby duraleigh » Mon 30 Aug, 2010 10:56

It seems like you may have already moved to the next step. If it's removed by the addition of acid, it's a pretty decent bet it's metal. You didn't say, but I'm assuming you saw no affect from the chlorine.

Yeah, it can be removed by doing an ascorbic acid treatment. I have not done that treatment but there are a lot of folks that have (and an article, I think) over on troublefreepool.com. metal staining is a little more involved but it can certainly be accomplished.
24x52 DIY concrete block and liner
1.5HP pump 925lb sand filter
http://www.tftestkits.net
fields
Pool Newbie
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Posts: 8
Joined: Thu 26 Aug, 2010 08:55
My Pool: gunite pool - clorine - 13,000 gal
Location: texaS

Stains On Plaster

Postby fields » Mon 30 Aug, 2010 21:35

No, I have not moved to the next treatment. I'm giving the chlorine several more days. I started the chlorine on Saturday. How many more days do you think that it should be before I might see if this is going to work?

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