I am a new pool owner of a 58k gallon gunite pool built around 1995. The salt chlorine generator is a Jandy P1400, rated for 40,000 gallon pools. The free chlorine is a little low this week, but the water is clear. The salt cell runs at 75% most of the time and the 1 hp single speed pump runs 24/7. The pool is not closed in the winter due to its size and difficulty covering. I am going to upgrade to a variable speed pump, but was wondering if I need to add a second salt chlorine generator? Thanks!