Does metal sequestrant eat up some of the chlorine? I've been losing 5-6 ppm of Chlorine daily and I usually only lose 3-4. I did an overnight test and I lost .5 ppm. I did a drop test and it remained clear.
Metal sequestrant/Chlorine
- Thread starter cledee
- Start date
- Jun 22, 2014
- 52,071
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
If you only lost 0.5 FC overnight but lost more during the day, I would be more inclined to suspect a low CYA may allow the sun to grab your FC as opposed to the sequestrant. Otherwise the sequestrant would've eaten FC overnight as well. Your last CYA was about 40 a week or so ago which might normally be fine in your area unless it's been unusually hot or your CYA is lower now from backwashing or something else. @Donldson could there be any other reason?
Will having the water temperature around 84-86 also cause bigger drop in chlorine? I suspected low CYA, but i just retested and got 40 again. My pool only gets around 4 hours of sun light.
- Jun 22, 2014
- 52,071
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Water temp does influence CYA loss, but not so sure that would explain your situation. A CYA of 40 would seem to be adequate based on your conditions.
Can you tell us exactly what brand of sequestrant you used? It may help when JD comes online to evaluate.@Texas Splash could Iron (iron bacteria) be coming from the pine trees behind the pool? I have a mesh cover and typically when I open the pool in the spring I have 0 chlorine. So if Iron bacteria was allowed to form a biofilm, over fall, winter and early spring, could this explain why I would get iron staining after a couple of years of build up? From my understanding you cannot kill Iron bacteria once it has formed biofilm, even with a slam and it would require a combination of products to breakdown biofilm and then killing it with Chlorine.
I'm only asking since our primary water source is from a protected lake, followed by a river that go through a pump station. I don't believe the iron is coming from the water coming in from the tap, especially since we get a lot of water change over through rain, snow, ect.
I'm only asking since our primary water source is from a protected lake, followed by a river that go through a pump station. I don't believe the iron is coming from the water coming in from the tap, especially since we get a lot of water change over through rain, snow, ect.
- Jun 22, 2014
- 52,071
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Hey, sorry for missing the previous mention. Unfortunately I don't have a whole lot I can add to this. I can say that neither iron nor iron bacteria would be introduced to the pool from pine needles. There's nothing special about iron bacteria, it would die quickly but even if it were to it doesn't synthesize iron so if it were carrying iron in to the water it wouldn't carry any more or any less by dying faster or slower.
The metal sequesterant may well be causing a higher FC demand, but that seems a bit higher than I'd expect. If you don't think you have iron in your water supply, what are you adding the sequesterant for? Are you getting staining that you've confirmed is iron? That seems unlikely given a vinyl liner, but if there's a stain that is being lifted by a vitamin C test then it's possible.
The metal sequesterant may well be causing a higher FC demand, but that seems a bit higher than I'd expect. If you don't think you have iron in your water supply, what are you adding the sequesterant for? Are you getting staining that you've confirmed is iron? That seems unlikely given a vinyl liner, but if there's a stain that is being lifted by a vitamin C test then it's possible.
@Donldson
I did a Vitamin C test and lifted the stains. I then did an abscorbic acid treatment and partial water exchanges and removed a significant portion of metals. 2 years ago I had the same issue with metals. I've tested my fill water and have not detected metals, so I decided to fill a small pool, and increased ph and added chlorine to see if I would get stains and I did not. So I can only guess assume it could Be from iron bacteria on pine trees that are allowed to grow over fall, Winter, early spring
I did a Vitamin C test and lifted the stains. I then did an abscorbic acid treatment and partial water exchanges and removed a significant portion of metals. 2 years ago I had the same issue with metals. I've tested my fill water and have not detected metals, so I decided to fill a small pool, and increased ph and added chlorine to see if I would get stains and I did not. So I can only guess assume it could Be from iron bacteria on pine trees that are allowed to grow over fall, Winter, early spring
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Sorry for the way my message came out, I'm on mobile and the browser messed up my reply.
- Jun 22, 2014
- 52,071
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Then that leaves us with a big question - where did the iron come from?
Odd. Remember that even with an AA or sequestrant, the iron is still in the water unless you changed it. So somehow iron managed to find its way into your pool. Either from airborne products, a local water supply that built-up over time, old plumbing, etc. You could try to filter through polyfill, but unless it's actively precipitating outwards (water color changes, etc) you may not get much.Similar threads
