oversiging cell for longer life?

[Brock]

I am thinking of going to a salt water system. My wife is concerned about the CL in our poolroom. Most of the time it is not a problem and keep it about 1-2 ppm. I understand with a SWG I can keep it closer to .5 (I revise that to 1ish) and should have less off gassing and greatly reduce the need to shock, which is really a pain indoors.

My first problem is my pool size. I was by our builder it was 15k, but since it is 4 feet to 10 feet and 13x27. According to Michael’s very cool little program (thanks!) I have an 18,500 gallon pool and attached 600 gallon hot tub. I guess I can just call it 20k to be safe?

So should I get a cell for 20k or a larger cell? Is it bad to oversize? The thing I thought was odd was that the larger auto pilots units have longer warranties so why not get a larger one that wouldn't run as much and lasts longer?

I have a compool controller if that matters and wired it all myself, so the electrical side isn't an issue for me.

Thoughts? Suggestions?