RO/DI Unit Conversion

I have convereted my RO/DI unit over to just a DI unit that produces no waste water. Now the water coming out is strictly DI water at zero PPM.

Below is the parts I ordered from Buckeye Field Supply for this project.
1. BFS-74 Add on DI housing
2. BFS-214 Add-on housing kit (2 of these)
3. BFS-67 Color changing mixed bed DI resin cartridge, refillable
4. BFS-70 Color changing mixed bed DI resin refill (2 of these)
5. BFS-240 2-pack, Specialty Sediment Cartridge, 1 Micron Depth Filter
6. BFS-275 2-pack, Specialty Sediment Cartridge, 5 Micron Depth
7. BFS-2 Carbon block cartridge - The Chlorine Guzzler, 10-inch
7. BFS-219 Carbon block cartridge - The Sweetener, 10 inch


The unit before the conversion

The parts


Valve 1 comes in from the water source while Valve 2 goes to the 65g drum. The valves are there to keep the water from moving to fast through the unit. The water has to have enough time to pass through the DI resin. I keep Valve 1 open all the way and use Valve 2 to adjust the amount of time I want the water to pass through the unit. I use a dual TDS meter and have opened Valve 2 enough to fill up the barrel in a reasonable amount of time while maintaining 0 PPM output.

A. 5-micron sediment filter
B. 1-micron sediment filter
C. Matrikx® Sweetener cartridge 2 micron
D. Matrikx® 1 Chlorine Guzzler .6 micron
E. DI Resin in top and bottom cartridges

The water supply comes in and goes to (A) 5-micron, then (B) 1-micron, then (C) 2-micron, then (D) .6-micron, then (E) DI resin before going to the barrel from the top DI cartridge.


The 65g barrel that holds my water. I keep a Mag Pump in it to supply the water.