Found this forum because all the links to the questions I 'googled' seemed to point back to you! So, as the title states, having a bit of trouble with the FC. Here is my progress.
Second year of owning a pool.. so very much still a newb. Pool is a 25k gallon with vinyl liner. I decided to convert to a SWCG this year and have everything installed and 'seems' to be working fine (powers on, reads salt level and was originally on 100% output upon pool opening).
After a few days of running the SWCG, I was still getting a zero FC reading on the test strips. (I know now.. test strips are the worst.. as I said, I am still a newb and they seemed to work ok last year.) Will be picking up a k-2006 from Leslies soon (maybe today). Was reading around and saw people for and against the 'myth' of chlorine lock. Put bleach in (3 of the 182oz bleaches) to attempt to raise FC. Waited a day, still showed no FC. Thought maybe my strips were bad, took a sample in to Leslies for testing.
TAC: 1 ppm
TA: 50ppm (Leslie's paperwork shows this as Low)
pH: 6.8 (also Low)
no metals showing (Copper, Iron)
Pho: 200 (shows as High)
So I was instructed to use 3lbs 8 oz of ChlorBrite and 4lbs of Soda Ash. So I did that. Soda Ash in first and then about 6 hours later, the Chlor Brite. Ran it for the night and checked the next day. No FC still. Turned the SWCG back on and ran it for a couple of days. Still no FC.
So then I head over to the Pool Calculator. If I look at the 'Chlorine/CYA Chart', it says for a CYA of 70, it's 28 ppm for Shock FC. Plug that in to the calc and it gives me 3.2 jugs of 128oz of bleach. (HERE IS MY MISTAKE yesterday). I somehow put in 10,000 gallons in to the calculator instead of 25k. So last night I put in 4 jugs of 128oz of bleach.
I read this morning and look at my open page and realize it had 10k and I up it to 25k in the calc. It says it was supposed to be 8 jugs at 128oz each. So I was 4 jugs short last night.
So my question is.. should that be my next thing to do? To get 4 more jugs as quickly as possible? I put those 4 in last night so the sun didn't eat up the bleach/chlorine during the day.. as its very sunny and very hot (90s) right now around mid-day.
So what next? Any help/ideas??