It somehow stuck in my head that I wrote "not even sure I smell it anymore". So I just went down to my mix that has been running since last weekend. No smell. Even the film is not as slimy. I have not washed the brute in several months. I cannot recall when I last smelled it, but I remember the smell. Body odor. Since the beginning, so +10 years ago.
We are on well water. A couple years ago, we had some well work done. Well guy said we should be testing the water in our area. I sent in a sample to town govt and tested positive for coliform bacteria. The house RO system and my tank water RODI can't do anything about bacteria. I had a whole house UV installed. I never remember an Aha! moment of no more smell. But it has been gone since the UV.
Again, I never had any problems using that water for nearly a decade, nor did my family ever suffer related symptoms, but food for thought. I think it cost me $20 bucks to get the test. (But $1,500 for the UV!)