We just had a new gunite pool built and waited 72 hours after plastering to add the chlorine as instructed by the pool builder. About 15-30 minutes after adding the chlorine, the water went from clear to a Greenish-Brown color. I had it tested and there was no iron, copper or phosphates in the water. The alkalinity was really high and PH was at 7.6. I’ve been working on lowering the alkalinity with muriatic acid. I’m also trying to get the chlorine level up to an acceptable range, but the higher it gets, the darker the greenish-Brown the water gets. Any ideas on what might be causing it?
New Pool’s Water Turned Greenish-Brown After Adding Chlorine
- Thread starter ksoper
- Start date
- May 3, 2014
- 58,649
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
You have iron in your water. Did the pool builder/plaster company add a sequestrant?
That’s what I thought too, but had it tested at Leslie’s yesterday and again today and both tests came back as 0 ppm for iron and copper. No sequestrant has been added yet. I will add some and see what that does. Maybe Leslie’s test is off? Some sort of heavy metal is the only thing that makes sense to me. Thanks for the suggestion.
- May 3, 2014
- 58,649
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
That would make sense. I’ll get a sequestrant and add it. Any one in particular that you’d recommend?
- May 3, 2014
- 58,649
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
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Sequestrants based on HEDP, phosphonic acid, or phosphonic acid derivatives are the most effective. ProTeam’s Metal Magic and Jack’s Magic The Pink Stuff (regular), The Blue Stuff (fresh plaster), and The Purple Stuff (salt) are some of the top brand sequestrants. There are also other brands with similar active ingredients, some of which are noticeably less expensive.