added ph+ and alkalinity anhd now have turquoise/black spots

Problems relating to pH and total alkalinity.
Increase ph, increase TA. Reduce pH, reduce TA.
pH chemistry advice and techniques for the pool.
krista

added ph+ and alkalinity anhd now have turquoise/black spots

Postby krista » Sat 02 Aug, 2008 16:31

ph was low as was alk - added 12 lbs of ph+ and 30 lbs of alk as per pool place. Now have tuquoise patches that disolve or d9isperse when brushed and black unmovable spots in the deep end! Help


Guest

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby Guest » Sat 02 Aug, 2008 19:00

Vinyl lined pool? The turquoise color suggests dissolved copper. With a low pH the water will attack metals in the water or in the pool system. If you have a pool heater the low pH will attack the heat exchanger.

When you raised the pH and TA the dissolved copper falls out of the water.

How low was your pH and for how long? Where is your pH and TA now?

krista wrote:ph was low as was alk - added 12 lbs of ph+ and 30 lbs of alk as per pool place. Now have tuquoise patches that disolve or d9isperse when brushed and black unmovable spots in the deep end! Help
krista

added ph+ and alkalinity anhd now have turquoise/black spots

Postby krista » Sat 02 Aug, 2008 19:30

ph was probally low for a while - I am not the best at checking it - my pool was clean so, I thought it was fine. I do have a heater - someone told me to shock the pool, so I did. The turquoise is beginning to disappear, but there are unscrubbable black stains on the bottom of the deep end along the edges and corners. Is that black algea? How do I treat that with a vinyl liner? Why did this just appear after adding ph+ and alk?
Guest

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby Guest » Sat 02 Aug, 2008 22:02

The black stains may also be from copper. If you can't scrap it off with a fingernail it probably isn't black algae. With the pH low, metals stay in solution. Raising pH, especially quickly, release metals from solution and they show up as stains.

A sequestering agent is used when you know you have metals in the water. This prevents the metals from coming out of solution.

To remove the black try placing a vitamin C tablet on the stain and hold it there for a minute. If it lifts the stain and you don't have many spots, continue on with the tablets. For more extensive staining you will need another approach.

Hope this helps. I'll check back to see how you're doing.

krista wrote:ph was probally low for a while - I am not the best at checking it - my pool was clean so, I thought it was fine. I do have a heater - someone told me to shock the pool, so I did. The turquoise is beginning to disappear, but there are unscrubbable black stains on the bottom of the deep end along the edges and corners. Is that black algea? How do I treat that with a vinyl liner? Why did this just appear after adding ph+ and alk?
krista

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby krista » Sun 03 Aug, 2008 07:06

The stains are extensive and large and 8ft down - I can't get down there. When scrubbing with a brush, is lightens slightly, but it is difficult. Any other suggestions since I can't get down to hold a vitamin c table on there.



Anonymous wrote:The black stains may also be from copper. If you can't scrap it off with a fingernail it probably isn't black algae. With the pH low, metals stay in solution. Raising pH, especially quickly, release metals from solution and they show up as stains.

A sequestering agent is used when you know you have metals in the water. This prevents the metals from coming out of solution.

To remove the black try placing a vitamin C tablet on the stain and hold it there for a minute. If it lifts the stain and you don't have many spots, continue on with the tablets. For more extensive staining you will need another approach.

Hope this helps. I'll check back to see how you're doing.

krista wrote:ph was probally low for a while - I am not the best at checking it - my pool was clean so, I thought it was fine. I do have a heater - someone told me to shock the pool, so I did. The turquoise is beginning to disappear, but there are unscrubbable black stains on the bottom of the deep end along the edges and corners. Is that black algea? How do I treat that with a vinyl liner? Why did this just appear after adding ph+ and alk?
krista

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby krista » Sun 03 Aug, 2008 07:28

just was out there, turquoise is back - and there is a film on top of the pool - black is still there covering at least helf of the deep end :( I am so at a loss. Help
Guest

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby Guest » Sun 03 Aug, 2008 07:42

It's important right now to track your pH. I would try to keep it at about 7.2. If it gets high you'll get more metal staining. If it gets down below 7 you'll dissolve more metals into the water.

I would pick up a sequestering agent from the pool store. This will hold the metals in solution and prevent staining. Most sequestering agent also lift stains. Black copper stains (if that is what you have) can be tough to get out.

There are lots of products on the market that will sequester metals and lift stains. As I said, right now keeping the pH in line is the most important thing.

If you have trouble testing pH and TA, bring a water sample to the store and have them test for you.

What type of chlorine are you using in the pool?

krista wrote:just was out there, turquoise is back - and there is a film on top of the pool - black is still there covering at least helf of the deep end :( I am so at a loss. Help
Guest

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby Guest » Sun 03 Aug, 2008 08:51

I am bringing a sample to the store shortly. Should I pick up something for black algae too, just in case that staining is black algae or just treat it as a metal stain for now? How do I get rid of all of the turquoise stuff.

My clorine is the pool frog clorinator.


Anonymous wrote:It's important right now to track your pH. I would try to keep it at about 7.2. If it gets high you'll get more metal staining. If it gets down below 7 you'll dissolve more metals into the water.

I would pick up a sequestering agent from the pool store. This will hold the metals in solution and prevent staining. Most sequestering agent also lift stains. Black copper stains (if that is what you have) can be tough to get out.

There are lots of products on the market that will sequester metals and lift stains. As I said, right now keeping the pH in line is the most important thing.

If you have trouble testing pH and TA, bring a water sample to the store and have them test for you.

What type of chlorine are you using in the pool?

krista wrote:just was out there, turquoise is back - and there is a film on top of the pool - black is still there covering at least helf of the deep end :( I am so at a loss. Help
krista

added ph+ and alkalinity anhd now have turquoise/black spots

Postby krista » Sun 03 Aug, 2008 10:50

ph is now 7.4 and TA is 160

I have metal out, should I wait till sundown to add it?
Guest

Re: added ph+ and alkalinity anhd now have turquoise/black s

Postby Guest » Sun 03 Aug, 2008 18:27

No need to wait.

krista wrote:ph is now 7.4 and TA is 160

I have metal out, should I wait till sundown to add it?

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