This is so the water has room to flow through the polyphosphates

Warranty : 1st year=100% credit

and 6 feet of tubing to re-join the pure water output lines and to join the waste water lines into one

0" diameter bottom cover plate

20" Twin DI with Dual In-Line TDS Meter RODISYSTEM This is so the water20" Twin DI with Dual In Line TDS Meter This 20" twin vertical DI color changing DI adder kit comes with two housing mounted on a bracket with two reusable cartridge filled with color changing DI resin. It also comes equipped with a dual TDS meter and comes with 24' of 3 8" tubing. Standard Features This unit comes with two 20" DI resin filled filters plumbed in a series. RESINTECH MBD 30 is designed to provide demineralized water with a resistivity