Also the fact that biofilms had developed is evidence to further support that. If you wipe a surface that’s covered in a biofilm it’s going to be very visible that it’s filthy. This is just pure negligence.
See page 19. I don’t know whether 10 minutes of exposure to 100ppm sanitizer will kill a biofilm adequately. Even “ppm” is vague. 100ppm of (active) hypochlorous acid is quite high and ought (IMO) to sterilize things effectively. But the recommended sanitizer is Stera Sheen Green Label, which, like most powdered sanitizers, is based on dichlor. 100ppm free chlorine worth of dichlor also adds about 90ppm of cyanuric acid, and cyanuric acid buffers hypochlorous acid, such that 100ppm FC + 90ppm CYA is a much worse disinfectant than 100ppm FC by itself.
Also, what disinfects the tubes between the filter and the reservoir?
(Why isn’t chlorine dioxide used for this purpose more often? It’s supposedly much better than chlorine for killing biofilms. Possibly less damaging to plastics as well.)
