Hi all. I searched pool school and read through some of the forum posts, but didn't find an answer so I figured I'd just ask. I recently drained my pool due to algae issue (and CYA around 100) and refilled it. After refilling, I ran tests to ensure pH, alkalinity, hardness, and FC were good. Everything checked out except FC was low (around 1). I've added some liquid bleach, plus I have Trichlor. The level is still a bit low, so I plan to bring it up to around 4, however it got me guessing on if I should have SLAM'd the pool immediately post-filling. Now I'm noticing a bit of build-up on the horizontal surfaces (steps, etc) that looks like a brown-ish "dust".
I guess the bottom-line is I'm not sure what all I should have done post-filling. Any help would be appreciated!
FYI - In-ground, Pebble-tec, 28,000 gallon w/ attached hot tub.