Sterile Res only works with Drain to waste. Too much organic matter in the recirculating systems for bleach or any other sterilizer to handle.
Even if your system works for a run or two, the pathogens will catch up, and seep into the plastics.
DRAIN TO WASTE ONLY.
I had a similiar bacteria that was resistant to everything. I never found a cure eventually it just passed through my water I think. anyway, you can put a UV sterilizer on your RO system or bigger ones for like a main house line that will kill all the stuff. (i didnt read the entire post so sorry if this has been discussed)
I use microbes now in my rez for flood and drain and am having better growth than i ever did dead