Light dusting at the bottom, is this algae?

[ehb4PSU]

A couple weeks back I SLAMMed my pool that had turned green. I got the water to a nice blue (Thanks TFP folks!)
But now even with scheduled brushing and vacuuming I still have a light dusting at the bottom of my pool. Water still looks clear but worried I didnt finish the job the first time. Thoughts?

This afternoons test results
FC 3 ( using about 50-60 oz daily of 10% to keep the FC right with CYA)
CC 0.5
PH 7.7
TA 150
CH 280
CYA 50

 

[Richard320]

Repeat the Overnight Chlorine Loss Test if you think there's still something growing.

I'd go have a look at windowsills and patio furniture and see if they have a layer of dust on them. It could be just as simple as windblown dust.

 

[ajw22]

A couple weeks back I SLAMMed my pool that had turned green. I got the water to a nice blue (Thanks TFP folks!)
But now even with scheduled brushing and vacuuming I still have a light dusting at the bottom of my pool. Water still looks clear but worried I didnt finish the job the first time. Thoughts?

This afternoons test results
FC 3 ( using about 50-60 oz daily of 10% to keep the FC right with CYA)
CC 0.5
PH 7.7
TA 150
CH 280
CYA 50

Pool School - Chlorine / CYA Chart

CYA of 50 requires a minimum FC of 4 and a target of 6-8.

Your CC dont show a problem brewing. You should up your FC and you might want to do an OCLT.

I think a bit of debris in the bottom of an outdoor pool is normal.

 

[ehb4PSU]

Good catch Allen, the post should have read; I just put the recommended amt by the pool app to bring the FC to right range.