White floating flakes

blasker

Member
Apr 9, 2019
6
Myrtle Beach
I have this floating on the top of my pool all over. It is a saltwater sand pump. I also added calcium and chlorine stabilizer few days ago and ran the pump for a few days. It looks like white flakes.
 

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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
15,004
Tucson, AZ
It’s most likely calcium scale from the SWG and the calcium addition. Please post a full set test results. And, if you wouldn’t mind, please fill in a signature in your profile with all of your pool info.
 

bere

Bronze Supporter
Feb 5, 2018
36
Mont Belvieu, TX
I have these too. I recently had to partially drain my pool to have a leak repaired, so when I refilled I had to add a lot of calcium chloride and soon after, I started seeing flakes floating around.
 

splashpad

Bronze Supporter
Aug 2, 2017
1,979
SE Kansas!
I have this floating on the top of my pool all over. It is a saltwater sand pump. I also added calcium and chlorine stabilizer few days ago and ran the pump for a few days. It looks like white flakes.
I think you have a vinyl liner, no calcium needed.
 

IMissNimoy

Gold Supporter
Jul 3, 2018
12
Columbia, SC
It occurs in my plaster pool. Chem is balanced. I noticed it got worse after a series of winds last week. Based on the wind direction that occurred, it's likely pecan tree or podocarpus pollen.
IMG_1604.jpg
 

Bruiser

Active member
May 31, 2013
26
I’m in Georgia and have the same thing going on in my pool right now. It’s pollen. If you run skimmer socks you’ll be able to catch all the nasty yellow pollen before it goes into your filter. You’ll also be able to see that those “white” flakes aren’t necessarily white.
 

IMissNimoy

Gold Supporter
Jul 3, 2018
12
Columbia, SC
It occurs in my plaster pool. Chem is balanced. I noticed it got worse after a series of winds last week. Based on the wind direction that occurred, it's likely pecan tree or podocarpus pollen.
View attachment 99179
Replying to my own post here and attaching a better picture. I decided this is not pollen in my case. Most of the major pollen here has passed. The blotches are one piece with interconnections, not a collection of pollen spores. They are white and resemble poorly formed snowflakes. In discussing this with a geochemist at work, he suspects calcium phosphate but admits it's a longshot guess. Given we have surficial source water, this makes some sense. I found an article that seems to support his theory. Thoughts? I'm hoping one of the cool chemistry nerds has a go at this. :)

Background: Pool was drained last June due to high CYA, Pool Service stopped, and started back as a TF pool. I used PuriTech 100% calcium chloride during start up. Prior to that, Pool Service used Phos-free and whatever else as chems were included. This is the first season we've noticed this. We keep our pool open and balanced all year. I'm coming off a shock after a kids swim party this past weekend. I've only used fresh Liquid Essentials or Shock-IT chlorine.
FC 7
CC 0
TC 7
pH 7.6
CH 200
Alk 100
CYA 40
Temp 78F
CSI -.13 (assumes 1000 for salt)
IMG_1635.jpg
 
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JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
15,004
Tucson, AZ
Highly unlikely it’s calcium phosphate. The chemistry of phosphate precipitation would require high pH, high CH and high phosphate levels. Phosphates are rarely greater than 3-5ppm in the worst case and so the chemistry would require a CH in the thousands of ppm to precipitate phosphates.

If it’s calcium carbonate it will “fizz” vigorously in MA. If it’s calcium sulfate, it will slowly dissolve in concentrated MA. Calcium phosphate will remain mostly undissolved even in concentrated MA. If you can capture these precipitates and acid test them, it will tell you a lot.
 

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