Water has greenish tint

Rob F

Member
May 3, 2020
12
Pennsylvania
SWG Type
CircuPool SJ-40
The water in my pool has a green hue to it, not blue. The water is clear. I had the water tested and these are the results:
CYA - 50 ppm
Total chlorine - 2.6 ppm
Free chlorine - 2.6
ph - 7.5
Total alkalinity - 90
Calcium Hardness - 400
Copper - 0.5 ppm

I am switching to Salt instead of chlorine as soon as the water gets up to temperature. I would like suggestions as to what to do about the color of the water. I am attaching a couple of pictures of the water to show the color. The debris on the bottom of the pool have since been vacuumed up.
 

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kellyfair

Gold Supporter
Bronze Supporter
TFP Guide
Jun 29, 2016
4,767
Tampa, FL
Pool Size
7000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
A couple of thoughts. First, do you have your own test kit? If not, we recommend you purchase one - either the TF-100 (linked in my signature) or the Taylor K-2006C. Your pool store test results are likely not accurate.

If your CYA and FC are close to being accurate, your FC is too low to prevent algae. See the Chlorine/CYA link in my signature. The debris you mention may have been algae that got stirred up into your water when you vacuumed. If it is algae, you will need to SLAM, and you will have to have your own kit when you do so. You can read about SLAM at the link in my signature.

Lastly, where does your fill water come from, and have you ever used algaecide that contains copper, or any other product that contains copper? That can also cause green water.
 

Rob F

Member
May 3, 2020
12
Pennsylvania
SWG Type
CircuPool SJ-40
I used an algaecide and that caused the debris on the bottom of the pool before I vacuumed it out. I have my own test kit. I'll test the water to see how it compares to the other results. Thanks
 

kellyfair

Gold Supporter
Bronze Supporter
TFP Guide
Jun 29, 2016
4,767
Tampa, FL
Pool Size
7000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
What algaecide did you use? Was the water already greenish when you added it?
 

Rob F

Member
May 3, 2020
12
Pennsylvania
SWG Type
CircuPool SJ-40
This year I used a 40% dimethyl benzyl ammonium chloride when I opened the pool. Last year I had an algae problem. It was on the walls of the pool and more like a slime. I used a copper based algaecide then. But like I said, the pool place showed my water had a copper content of .05 ppm. They said that was well under the allowed limit. Should I get something like Metal Out?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,136
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
^ I agree. Although store testing is always questionable, if they are showing 0.5 copper, that's too high. Now that you are with us at TFP, you'll see in many discussions how we caution people about wells (iron) and copper products. Once those are in the water, your best bet is to try and do a water exchange to lower that metals content. Only then can you manage things properly. Copper is especially tough because those stains can be very difficult to remove later. Best to exchange some water now if you can. Not all at once as you don't want to float the pool, but definitely start the process.
 
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