Need a Little Advice

[Enkil810]

My pool water is balanced but I keep getting a brown/greenish film on my pool steps. Why would you be getting this if your pool water is balanced and a combined of 0? Do I need to SLAM again? Did it a couple weeks ago but we have had alot of rain lately.

FC- 4.66
CC- 0
PH- 7.7
Alk- 130
CYA- 35

 

[Richard320]

Probably poor circulation. How often do you brush in that area?

 

[Oly]

Diagnose this situation with an Overnight Chlorine Loss Test
You will need a quality test kit to accurately test your FC loss.