Thanks for help. Here are my pool stats:
Per Cubby Unit:
Salt 3200
Temp 80 degrees F
Amp 17v, 4.9A
Amp Hrs 018009
Purifier - recently on 100%
Per Pool Store water test yesterday:
Chlorine 0.0 ppm
pH 7.6
Tot Alkalinity 90 ppm
Calcium Hardnesss 200 ppm
Stabilizer 60 ppm
Total Dissolved Solids 4700 ppm
Salt 3200 ppm
Again my story is a 12,500 salt pool about 3 years old. Chlorine usually 2-3.0 ppm running purifier at about 50% in summer. Couple weeks ago chlorine just dropped quickly to zero. Replaced cell, added powder chorline to get to 3.0 ppm, then ran new cell at fairly high rate - 70%. But after a week chorline back to zero. (Did have high phosphates (500) which is lowered, but still zero chorline even with purifier at 100%.)
So I'm thinking next step is cord replacement. Question -- picture of replacement cord shows two "male" pins on end that plugs into Cubby, but my existing card appears to use a plastic snap in housing (can't see the two pins).
Ideas?