Does this look like mustard algae?

[kaymaza]

Hey everyone so today I was getting ready to brush the bottom of my pool when I noticed this collection at the bottom. I thought it was just dirt but I'm also wondering if this could actually be mustard algae? I swept it towards the main drain and it suspended into the pool like it was dirt. I've been noticing that my FC levels have been slowly dropping. On 2/1 I recorded my FC as 7.5 ppm. 2/2 FC was 6.5 ppm. 2/3 was 6 ppm. 2/4 it was 5 ppm. Today I recorded FC as 4 ppm. CYA has been <30. What do you think guys think should I just treat it as mustard algae and perform the SLAM process? I've also included some GoPro footage of this that I've uploaded onto Youtube. Appreciate any help thanks everyone!

 

[kaymaza]

Here's another video that I took just now. There is a wind advisory here in the Las Vegas valley so I'm not sure if this could also just be dirt that has collected at the bottom.

 

[PoolStored]

Looks like dirt, I wouldn't overreact. With FC of 5 and CYA <30...dirt. Best course of action is to perform this test, Link --> Overnight Chlorine Loss Test

 

[kaymaza]

Looks like dirt, I wouldn't overreact. With FC of 5 and CYA <30...dirt. Best course of action is to perform this test, Link --> Overnight Chlorine Loss Test

Okay will do. I'll plan to perform OCLT. Thanks!

 

[PoolStored]

Okay will do. I'll plan to perform OCLT. Thanks!

Before = after sunset. After = before sunrise. oooooh those early mornings...

 

[JamesW]

Possibly mustard.

I would do a SLAM.

 

[kaymaza]

Before = after sunset. After = before sunrise. oooooh those early mornings...

Forgot to mention that I'm currently adding CYA. That shouldn't affect the results of the OCLT in any way correct?

 

[kaymaza]

OCLT performed. Yesterday evening FC was 4.5, CC 0. This morning FC was 3.5, CC 0. I'm right on the border. I guess right now I should just continue to observe?

 

[JamesW]

I would do a SLAM.

 

[kaymaza]

Alright so I performed another OCLT and yesterday evening after sunset FC was 15 CC 0. This morning before sunrise FC was 17.5 and CC 0. No visible algae present. The SLAM process took about 2 days. Not sure why my FC went up to 17.5 but nevertheless, does 2 days of SLAM sound okay as long as the all the criteria are met to discontinue the SLAM process?

 

[PoolStored]

Not sure why my FC went up to 17.5

Jandy Tru Clear Salt Chlorinating System
^^ Did you turn off your SWCG?

 

[kaymaza]

Jandy Tru Clear Salt Chlorinating System
^^ Did you turn off your SWCG?

Yup it's been off.

 

[PoolStored]

Yup it's been off.

Likely testing error. Do you have a speed stir? How "fast" do you squeeze off the drops? (HINT:you should squeeze evvvvvvver so slightly, let the drop form and drop off the tip on its own). Do you hold the bottle vertical?

 

[Newdude]

Was the pool well mixed for each test ?

 

[kaymaza]

Likely testing error. Do you have a speed stir? How "fast" do you squeeze off the drops? (HINT:you should squeeze evvvvvvver so slightly, let the drop form and drop off the tip on its own). Do you hold the bottle vertical?

I do have a speed stir bit I don't use it for the FAS/DPD chlorine test. I angle the bottle about -30 to -45 degrees and then apply the drop one at a time while tapping the test tube so that it can mix accordingly.

I agree I do think it's a testing error. I checked the chlorine levels again this evening and got an FC of 15.5 and a CC of 0. Yesterday evening I had an FC of 15 and CC of 0.

 

[kaymaza]

Was the pool well mixed for each test ?

Yes it was. I've been running my pump 24/7 throughout the SLAM process.