Apparently they are working (and this was recommended by the installer of our Quantum Whole House Disinfection System) because we need to clean our water collection tank so it's probably overloading our micron filters a bit, but before we did this and our other micron filter last time replaced, the water pressure got worse every day, but when we changed the filters, the pressure was perfect. And then, three days after we had to change the filter again (so today), two or three months later, whatever it was, the water pressure started to suffer again! Then after the replacement everything is fine. That's proof enough for me that he's doing his job.
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