The DP-4 is a new, affordable dosing pump with 4 dosing heads. You can program each pump to come up to 24 times a day and dispense a precise amount of solution, which allows a user to keep their tank parameters stable, and removes the need for mixing supplements daily. The controller is easy to use and advanced, and each pump can be programmed individually. The DP-4 is perfect for any tank, as it allows for dosing in both large and small increments. The DP-4 comes with a power supply and is plug and play after it is calibrated with a 100 ml graduated cylinder or measuring cup (not included).