Well, I learned the hard way that the water coming out of my well has a high CO2 content. I burned through a pound of DI resin and only got 40 gallons out of it.... To keep this from happening again, I could either buy lots of RO/DI water or remove the CO2 from the RO water before I pass it through the DI resin. (This design is based off of the Spectrapure design.) Parts List: 3" PVC (36") 3" PVC Cap 3" Knock-out Cap 3" to 1.5" PVC Tee 1.5" PVC Street 90 Elbow 1.5" to 3/4" Reducing Bushing 3/4" PVC (12") 3/4" PVC Threaded Coupling (Female) 3/4" Male Thread to 1/4" Quick Connect Adaptor Air Pump Air Stone PVC primer and cement Teflon tape Assembly: The parts are shown in the image above in the order you would connect them. Cut the 3" PVC pipe about 6" down Attach the 3" PVC cap to the bottom of the longer section from step 1 Attach the tee between the two pieces. Attach the street elbow to the tee and the reducing bushing to the street elbow Attach the piece of 3/4" PVC pipe to the reducing bushing (you can shorten the pipe if you'd prefer) Attach the threaded coupling to the 3/4" PVC pipe Apply teflon tape to the thread-to-quick connect adaptor and thread it onto the coupling from step 6 Drill 3 3/8" holes into the knock out cap Thread the airline tubing through the bottom of the knock out cap, be sure the air stones are on the bottom! Insert the knockout cap into the top of the short section of 3" PVC Attach the air line(s) to your air pump (OPTIONAL) Secure your air pump to the 3" PVC Insert the output of your RO filter into the remaining hole of the knock out cap (only insert it a few inches) Attach your DI chamber to the 1/4" quick connect fitting That's it! Use: To use the degassing chamber, simply run your RO water into the chamber with the air pump running. As the water enters the chamber, it will be oxygenated and the CO2 level will be reduced. When the water level is high enough, it will trickle out of the tee and through your DI resin. Put the output of your DI resin into a bucket or holding tank and it is ready for use.