Mustard Algae (I think) on pool floor despite high FC

[Meat Friday]

Fiberglass pool with
FC 16.5
CC <0.5
CYA 40
Ph 7.6 CC

Chlorine level seems to be holding yet there is light brown greenish algae on the bottom of the pool in corners etc. There is also the white/gray "dust" that I assume is dead algae. No algae is growing on the walls (which I had last time I had an algae problem). The water is crystal clear.

Is it likely that what I am seeing is just dead algae?

New first time pool owner.

I have learned a ton from this forum. Thanks!

 

[reggiehammond]

Are you using one of the recommended test kits?

Swimming Pool Test Kits Compared

What pool test kit should I buy? Why not use test strips? Our recommended test kits will pay for themselves in no time!

www.troublefreepool.com

Are you following the SLAM process? I assume you're trying as your FC levels are around the mark according to FC/CYA chart.

SLAM - Shock Level and Maintain

We’ve all had to deal with a green pool. Clear algae from your pool with a SLAM! Read here to use shock level and maintain to clear your pool.

www.troublefreepool.com

The Free Chlorine and Cyanuric Acid Relationship

Managing your cyanuric acid and Free Chlorine levels is key to stabilizing your pool. Learn how these two items affect each other.

www.troublefreepool.com

If you're brushing, dosing FC to stay at SLAM levels, and seeing dead algae, it will take some time for your filter to catch it all.

 

[randytsuch]

If you have a good test kit, per the post above, you can perform OCLT
This will determine if there is something (algae) in your pool.

 

[Meat Friday]

Yes, those numbers are from my tests with my Taylor K-2006. The FC doesn't seem to be dropping much. I will try the overnight test. I was just curious if it is normal for algae to only be on the bottom and for the water to be clear. I was wondering if maybe that is a sign that the algae is likely dead. The one time my algae got out of control the water was cloudy for days and the algae was all up the walls of the pool. Thanks for your help.

 

[reggiehammond]

Yes, those numbers are from my tests with my Taylor K-2006. The FC doesn't seem to be dropping much. I will try the overnight test. I was just curious if it is normal for algae to only be on the bottom and for the water to be clear. I was wondering if maybe that is a sign that the algae is likely dead. The one time my algae got out of control the water was cloudy for days and the algae was all up the walls of the pool. Thanks for your help.

Somewhat normal to see dead algae, especially when the problem was not bad to start.