I've had a Jandy SWG for 2.5 years - love the thing. Over the past two month, though, I've had major trouble keeping the FC level up. I know the first thing you think of is CYA level. I've had it checked numerous time, myself with both the test strips and the TF-100 kit, and at the local Leslie's pool, and the level seems ok (around 70). Everything else chemically is perfect, but still can't get the chlorine level up. We've dumped a lot of liquid into the pool lately, which will get the level up slightly, but 24 hours later it's gone. I've checked the SWG cell and it looks great, hardly any buildup at all. Can it just go bad and not generate any FC?