19k gal IG Vinyl. Closed last year (covered), opened this year to green swaped.
Cleaned bottom (even though I cant see it) to remove sludge (not a ton, but decent amount). Vacuuming or sweeping every day.
CYA at zero and remaining there despite having added 20 lbs.
Ammonia (as tested with my aquarium kit) only .25 to .5 ppm.
Now the fun math/testing method part:
Over the past week, I've added about 46 gallons of 12.5% liquid shock.
To get my TC and FC, I've had to do the following:
10ml sample. Should turn pink with 1 or 2 dippers of DPD Powder. Takes 4 dippers to get it to turn (and stay) pink. Because TC is so high?
Added 160 drops of R-0871 before it turned clear (so 80 ppm TC).
Normally add 5 drops of R-0003 to get it to turn pink again, but had to add 10 to 15 drops to get it to turn pink (because I added so much R-0871?)
Few drops of R-0871 and it went back to clear (so it would appear essentially no FC).
Is my usual way of testing with these reagents off due to the super high TC?
Even at 80 ppm TC, should I keep sending it higher until I can get a reasonable FC reading? Or should I wait for TC to come down some?