I have a 10,000 Gal, in ground gunnite pool, 15 years old. Pool is in good shape, but equipment is tired. Salt cell died, its controller is old firmware. Cartridge filter, single speed pump. All Hayward stuff. What is the most economical route for a new variable speed pump, cartridge filter, salt controller and cell, and electronic control for all, especially the pump. (Not a mecanical timer.) I can do it all, but looking for recommendations for the best equipment route for all new. I live near Tampa, freezing is not a problem.Thanks.