In-ground pool, about 23,000 gal. system. I can't get FC up to spec. with my t-9 Goldline system. I get zero chlorine with drop test but did get a normal reading at the jet, but should the jet show a high chlorine level when system on superchlorination? My CYA seems on low end. PH about right. Trying to decide if generator is failing. Voltage and amperage is just out of manual stated ranges but probably within tolerance.