I am also on a well and had the same problem. I now degass and it has been over six months since I started and am on the same canister of DI resin.
After the RO membrans the water goes into a 52 gallon Brute container and there is an airstone in there that I just run all the time. After 24-48 hours I pump the water throught the DI and either into my ATO Brute (32 G) or the AWC brute.
Hi there, I found your post when googling RODI degassing. I'm curious what you use to pump your water from your degassing can into your DI resin canisters. I'm looking to set up this for myself. Thank you in advance!! -NB