Dear Pool/Spa geeks:
Hi. I used to use bromine but switched to the BBB method for economy and ease. I am having trouble to get my FC to read at all. Here is my current setup:
Using Taylor bromine kit 2106 upgraded to chlorine reagents. Test kit is now 1 yr old. Chlorine reagents only one month old.
I have mountain spring water, no muni processing. We have our own enclosed well.
CH is 180
TA is 100
pH out of the tap is 7.5
350 gal spa set to 104 F.
Monday 10/25 added 1.8 oz dry weight (52gr) pure CYA (not Dichlor)
Tues 10/26 CYA reads low (sorry I made no note). Added 55gr more CYA
Thursday CYA test reads 50.
FC remains clear after two scoops R-0870.
Added 1/2 cup 6% bleach.
Friday NO FC showing.
Go the the Pool Calculator (PC). It says to get 4 ppm FC add 2.9 oz bleach. I do.
Sat today. 2 scoops R-0870. Stays clear. 3 scoops, 4 scoops... still clear.!
I don't think my FC is so high that I have to keep adding more R-0870 to even get a pink flash! right? I don't want to use it all up so fast!
Test CYA, (in bright light after looking at Taylor link) . CYA is 60
My pH had gone up to 8.0. 3 drops acid demand to reduce it to 7.4. PC for 350 gallons says add .6oz HCl. Taylor book says 1.10 oz for 400 gals. I add 1.0 oz HCl. pH drops to 7.4 in 2 hrs.
My water is nice and clear. There was a little rank smell a week ago, I shocked with 2 oz Ca Hypo. Right now I am going by water clarity and smell (!) until I get this FC worked out. Am aiming for FC = 4.
What am I missing to get FC to read??