Two days ago I dumped in 6.75 gallons of 11.5% NaCLO to shock my pool and try to clear out the dead stuff so my IC40 SWG could keep up in an 18K gallon pool. With salt, CYA, TA, and pH all in the normal range, the first 6.75 gals didn't even register on the Cl meter, but seemed to clear the light green haze. Ran the pump all night and next day. Next afternoon, Free Cl was back down below 1.0, total Cl was still +.5 greater, so I dumped in the rest of the 15 gal barrel. I got a "HI" spike on the Color Meter, validated with the hardware store manual test kit, but within an hour, was back down in the low single digits. Left the pump/SWG running all night at 100%, checked again this afternoon; Free Cl = .16, Total Cl = .24, water clear and blue (Borated with 20-mule team many months ago). All three days have been somewhat overcast and pool tem about 80 - 85.
Tested the pump return and got 2.4 & 3.2 for free and total Cl. New IC40 back in Aug. I've been floating Tri-chlor/Tri-azine tabs in an effort to supplement the IC40. I also use Algimycin 2000 and Sea Klear Problem Klear for algae control.
18K, 1" tile, IC40 SWG, Borated, Hawaii-Oahu