Been slamming for 3 days
TA 130 (I use trichlor)
pH - 7.3
FC - 22
CC - varies during the SLAM, 0 - 2.5
I've been maintaining FC 20. My CC has been as high as 3.0. During the day the water is crystal clear but there is mustard colored stuff on my vinyl liner, think dark brown mustard color. As hard as I brush it has no effect. I really thought I had the algae beat until the last hour. FC wasn't dropping and CC = 0.
Within 60 minutes of the sun going down and me scrubbing pool earlier there is now a dark mustard stain to everything. Brushing has no effect.
This is with CYA 50 or less and FC 22, CC =0. I'll keep slamming but wanted any help. I've followed TFP guides for years with great success and am at a loss on this one.
It's the fact that the plastic chairs were clear during the day and within 60 minutes turned mustard brown once the sun went down, even with a FC of 20+ that has me concerned.