black streaks on 3m plaster surface

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

black streaks on 3m plaster surface

Postby trump » Tue 27 Nov, 2007 15:38

my pool has black stains on the walls and all chem are fine could this be caused by electrolysis from not bonding the salt system?


Guest

Re: black streaks on 3m plaster surface

Postby Guest » Tue 27 Nov, 2007 15:39

trump wrote:my pool has black stains on the walls and all chem are fine could this be caused by electrolysis from not bonding the salt system?
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mr_clean
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Postby mr_clean » Tue 27 Nov, 2007 16:27

black streaks on 3m plaster surface
my pool has black stains on the walls and all chem are fine could this be caused by electrolysis from not bonding the salt system?


can you give chemical readings?
FC-free chlorine
TC-total chlorine
CC-combined chlorine
PH-reading
TA-reading
CH-hardness
CYA-conditioner
Have you had water tested for metal/minerals?
are black stains only on walls or floor also?
what color is 3M?
do you fill pool with well-water?
trump

3m

Postby trump » Tue 27 Nov, 2007 16:58

3m color is blue
ph 7.4
chlor 3.0
free chlor 3.0
cy acid 100
tds 2500
hardens 800
some stains on bottom but spa has no stains
Guest

Re: 3m

Postby Guest » Tue 27 Nov, 2007 18:53

trump wrote:3m color is blue
ph 7.4
chlor 3.0
free chlor 3.0
cy acid 100
tds 2500
hardens 800
some stains on bottom but spa has no stains
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mr_clean
Swimming Pool Superstar
Swimming Pool Superstar
Posts: 398
Joined: Thu 16 Aug, 2007 14:32
Location: So Cal

Postby mr_clean » Tue 27 Nov, 2007 19:16

3m color is blue
ph 7.4
chlor 3.0
free chlor 3.0
cy acid 100
tds 2500
hardens 800
some stains on bottom but spa has no stains



I think you probably have staining problem from metals in water. You can take a sample to pool store & have them check it.
Your hardness level is 800 which should be 150-400, draining some water & refilling until you get there will do it.


you can take a white sock & add 1-lb PH decreaser & let it sit on a stain for 15mins & if it starts to come off it's metals.
using a bottle of sequestering agent/metal-remover after lowering hardness & using as preventative will help for future.
To get stains out you would need to lower PH to 6.8-6.5 for a couple days & scrub stains as much as possible until gone. Then readjust PH.

If stain does not start to come off then it would be black-algae & you could take a chlorine tab & rub it on a spot & let in sit on it for 1hr. If it comes off then BA.

The only time I have seen electrolysis problem, is people with pools next to under-ground electrical lines next to yard & its not black but a light gray & looks like a spider web in plaster not on outside of it.

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