I'm curious.....

I noticed the Pool Pilot is much more expensive than the Hayward Aqua Rite. Any particular reason you chose the Pool Pilot over the Aqua Rite?

Btw, I have an Aqua Rite and have been happy with it.

To answer your question, the more you oversize the cell, the longer it will last. I use a 40k gal rated cell, the largest Aqua Rite offered at the time, for my 20k gal pool.