Hi, Guys.
We've never had the system cleaned but the water seems to have lost it's odour now. I backwashed the system 3x and that seems to have done the trick. I'm thinking that perhaps the backwash funtion wasn't working correctly without the salt in the brine tank. Maybe the water that was standing in the brine tank was funky. I dunno, I'm just glad the bathroom only stinks when it is supposed to now.
Cheers, Max