Green Pool Due to Copper

Rocco

Well-known member
Dec 23, 2012
263
Manassas Park, VA
I am currently maintaining one of my relatives pool for them and go over every 3 days. Yesterday I elevated the chlorine level to make sure that the chlorine would be sufficient until I returned in 3 days. Last night they added some water (they are on well water) and left the hose on accidentally throughout the night.

The pool now has a green tint to it, I assume this is from copper in the water.

Does anyone know how long the water will retain the green tint? Would the green tint go away once chlorine levels are lowered?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
More than likely the green is from iron in the well. Regardless, once a metal is in the water the only way to remove it is by changing the water with fresh water. If that is not possible, all you can do is try to filter the water with a material from the skimmer that has a slightly better filtration capability (i.e. Polyfill, cotton T-shirts, etc) and hope you remove enough of the iron to lower the level in the water so that it doesn't react to the chlorine. Owners who live with well water also use a good sequestrant throughout the season to keep the iron in solution form to prevent it from changing the water color or causing stains. Also understand that an elevated FC and pH can both cause iron to react in the water.

Also see:
 

JohnT

Admin
Mod Squad
TFP Expert
Apr 4, 2007
9,900
SW Indiana
Likely from iron in the water rather than copper. Iron adds a yellow tint which looks green with a blue pool surface. Copper is pretty rare in well water.

Impossible to guess about how the water will behave. If they ran the hose overnight, I’d bet the FC level is already down. A good metal sequestrant and 24/7 filtering is about all you can do. Jack’s Magic products are good.
 

Rocco

Well-known member
Dec 23, 2012
263
Manassas Park, VA
Thank you both. You are correct it was much more yellow in color than thought and there are iron stains in the dishwasher and other places within the house.

Added two bottles of Metal Out from Leslies and 20 hours later the color has faded a significant amount, however it is not completely gone.

Any idea if I should wait longer or if I need to add another bottle of Metal Out?
 

Rocco

Well-known member
Dec 23, 2012
263
Manassas Park, VA
Got to the house and backwashed the sand filter and the water ran dark brown/brick red for about a 90 seconds. Went through the backwash / rinse cycle a few times until the water coming out was clean.

Added another bottle of Metal Out and added Polyfil to the skimmer basket (Large box of Polyfil was found at a local Walmart for under $30).

Will check in over the next couple of days to see if the Polyfil is absorbing anything and changing colors.
 

picchu55

Member
Jun 16, 2020
24
Oklahoma City, OK
Do you put the poly-fil directly in the skimmer basket? Or should it be contained somehow? Also, should I switch to only pulling from the skimmer while I have poly-fil in there? Reason I ask is I'm starting to think my pool's greenish tint is due to iron in the water since my OCLT for the past few nights has been 0.5 or less, so I'm thinking about trying poly-fil to see if that helps.
 

Rocco

Well-known member
Dec 23, 2012
263
Manassas Park, VA
I did put the poly-fil directly in the skimmer basket, I did not use anything to contain it but I will use a skimmer sock next time just to make myself feel better.

I also isolated to pull from the skimmer only, you will want to check it every day as debris will also get stuck to the poly-fil.
 
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