I am installing a new pool and the PB's proposal includes an IC-20 Pentair Intellichlor salt sanitization system. My pool is approximately 10,000 gallons. I have read that some people recommend upgrading to the IC-40 even with a small pool. Can you all please provide your input? What are the pros and cons of the IC-20 vs an IC-40 with my size pool? I am in Central Florida if that matters. Thanks to all!