Clear greenish/blueish water

[David Link]

My pool has been clear for most of the summer since opening it. I have noticed that only and everytime I add 12% liquid shock the water goes from being clear to a light greens/blueish color, which I have never seen before in all of the years of having a pool. It seems to clear up after a period of time. I have performed a basic test of the water and have
Cya 10ish
TA 120
ph 7.6 to 7.8
FC 3
tCf 5
Th 150ish
I had attached a picture of the water

 

[Texas Splash]

I'm not seeing the pic yet, but are you on a well?

 

[Texas Splash]

Also, what products do you use to chlorinate the water?

 

[David Link]

I'm not seeing the pic yet, but are you on a well?

No sir

 

[David Link]

Also, what products do you use to chlorinate the water?

The only product I generally use to maintain water levels is this. I have used this for years. And as stated my water is always clear until i add this

 

[Texas Splash]

How about algaecides for winter? At this point I'm looking at two possibilities:
1 - You have iron in your local water supply. Maybe not a lot, but enough to where it's been increasing over time and reacting when you increase the FC level.
2 - Some algaecide or other product introduced copper. But copper doesn't always result in a water color change. A sign of copper would be your cart filter starting to look turquois in color.

 

[Texas Splash]

Here's a nice DIY test you can try for possible iron.

How to test for Iron without sending out water to testing lab or pool store! (pics included)

I originally posted this in another thread regarding an AA treatment another TFP'er is going through but I felt it warranted it's own thread specifically. If anyone is concerned their fill water or auto-fill water has Iron in it, you can do a 5-gallon white-bucket test with your water. Iron in...

www.troublefreepool.com

 

[David Link]

I have not added any algaecides

 

[Texas Splash]

I have not added any algaecides

Sounds like you've been very careful about wat goes in the water. Maybe try that iron test linked above. Sure seems like iron got into the water somehow though. By any chance do you have old iron plumbing supplying water to the pool? Any old steel products in/around the pool (i.e. ladder) that may have rusted? You might also check online with your city/county annual water report. Sometimes that provides clues about metal levels in the water.

 

[David Link]

Sounds like you've been very careful about wat goes in the water. Maybe try that iron test linked above. Sure seems like iron got into the water somehow though. By any chance do you have old iron plumbing supplying water to the pool? Any old steel products in/around the pool (i.e. ladder) that may have rusted? You might also check online with your city/county annual water report. Sometimes that provides clues about metal levels in the water.

I have all pex, and no steel products around or in pool. I did the bucket test using water from the source and added the same product to it, mixed it and a half-hour later the water looks fine.
Before

AFTER

 

[Texas Splash]

Well shoot. I'm surprised. Let's go back to your original post #1. How are you testing your water? Your signature doesn't list a test kit. You noted a very low CYA, but the TF-100 and Taylor K-2006C test kits don't go that low. If your CYA is indeed close o zero, any chlorine you add to the water has a much stronger effect on metals without the buffering protection of stabilizer.

That reaction with chlorine is indicative of metals, but it is very odd you had no reaction in the bucket test.

 

[JamesW]

Looks like copper.

Can you show the system?

 

[David Link]

Looks like copper.

Can you show the system?

Looks like copper.

Can you show the system?

 

[JamesW]

Why is the cartridge blue?

"Antimicrobial" and blue usually means copper.

Does it use copper?

Ask Pleatco if it has copper.

Customer Support Assistance and Partnering Info | Pleatco

Contact us for our personalized service and support. View our product catalog to satisfy your pool and spa needs or opt to become our official Pleatco partner.

www.pleatco.com

 

[David Link]

Well shoot. I'm surprised. Let's go back to your original post #1. How are you testing your water? Your signature doesn't list a test kit. You noted a very low CYA, but the TF-100 and Taylor K-2006C test kits don't go that low. If your CYA is indeed close o zero, any chlorine you add to the water has a much stronger effect on metals without the buffering protection of stabilizer.

That reaction with chlorine is indicative of metals, but it is very odd you had no reaction in the bucket test.

I used to use a tf100, but since my pool levels always seemed fine over the years I started using strips, yes I know you all are telling at me now lol.

 

[David Link]

Why is the cartridge blue?

Does it use copper?

No copper system in pool setup, I guess it was just. A filter I purchased, and am getting ready to order a new filter, should I just get a plain white one?

 

[JamesW]

Antimicrobials operate through two modes. The first is a diffusion mechanism whereby the treatment diffuses to the outer surface of a coating.

A microorganism then picks up the typically cationic, or positively charged, metal ion off the surface.

That metal ion could be copper, silver, zinc or another metal.

As the microorganism attempts to absorb the metal ion, it is destroyed.

The outer media surface automatically refreshes until the antimicrobial treatment runs out.

Through the laws of diffusion, higher concentrations of a substance always migrate to lower concentrated areas, with the only secondary consideration of electric charge when present.

https://www.poolspanews.com/products/a-close-look-at-the-workings-of-antimicrobial-filtration-media_o

 

[David Link]

No copper system in pool setup, I guess it was just. A filter I purchased, and am getting ready to order a new filter, should I just get a plain white one?

This is the info on the filter, I thought it's properties we're better Pleatco PWWEK200-M Antimicrobial Filter - The Pool Supplies Superstore, but as noted is this even needed, and a standard white filter would be all I need? Like this one Pleatco PWWEK200 FOR POOL FROM PLEATCO PWWEK200 FROM

 

[JamesW]

should I just get a plain white one?

Yes.

Give it a few days and pull the new white cartridge.

If you have iron, the cartridge will be brown or yellow.

If you have copper, the cartridge will be blue, green or turquoise.

 

[David Link]

I am still struggling with the water in our pool everytime I add 12% clorine. I have not pull a water test as of this morning, and nothing has changed feom previous years. I also notices light green marks on the bottom of the pool. I installed a brand new filter 2 weeks ago and run our robot pool cleaner weekly. Here are some pictures from this morning