I have a question about SWG. We are getting the IC20 which is rated for 20K gallons the pool will end up being a little more than 11K. The pool builder said I can do the IC 40 for the same price, but the IC 20 is best and doesn't want to over chlorinate the pool with the IC40. It sounds like from my very limited knowledge is that the IC 20 would be fine, but should I go with the IC 40? Wouldn't the IC 40 just run a lower percentage with plenty of room to produce more if needed? Thanks for the help.