Fleck 3900 3" brass meter adder makes the controller become electronic.
Add this to make the system regenerate based on water usage.
Note, your daily capacity used multiplied times three should not exceed two thirds of the total system capacity for a meter to be efficient. EXAMPLE: You use 1000 gallons per day and your hardness is 25 grains. Your daily capacity requirement is 25,000 grains. Multiply 25,000 x 3 for a total of 75,000 grains required in three days. The minimum sized metered system should be 112,000 grains total.
