Autopilot's Digital Salt Water System's most programmable Salt Water Pool System package to date. The 75003 Salt Water System Controller has programming features that operate the Salt Water System and Cell as well as allowing for integration of the Autopilot Total Control pH/ORP Chemistry Controller and Acid Tank and Pump as well as a CAT Controller ORP/pH Cntroller with Acid Tank and Pump. This controller will operate on purification mode with the salt water cell, and when you add an ORP/pH Chemistry Controller you program the controller to operate in Total Control Mode allowing for a fully integrated-fully automatic water chemistry system. This system comes with the Digital Salt Water Chlorine Generator Controller (75003) and your choice of Salt Cells based upon your total pool gallons, bather loads, and pump run times. In Purification Mode (Default Mode from Factory) the system will display Calender Info, Water Temp, Salt Content (PPM), How Much Salt to Add (Lbs) when below 2500 PPM, Purification Rate, Super Boost, Cell Amps/Volts, and Warning indicators. NOTE: Highly Recommended to oversize your system to the next size up...example 18K Gal Pool - Choose the DIG48 System (TCS2SC48SUS)(40K Gal). FREE UPS GROUND SHIPPING inside Continental USA. NOTE: FOR INTERNAL PRICING PROMOTIONS PLEASE CALL BEFORE ORDERING.