I had same Problem mask liners did the trick for me!!! some time the NEW mask liner worked ok for a short while Then they started I would use a liner it fixed that some times I will wash hand soap or dish soap and let them dry when you wash them they will shrink back to size too I will try to cut my...

I use CLR Calcium, Lime & Rust Remover and It WORKS GREAT Yes I se city tap water too Just Replace { pour out }the water when it gets low because real low water in tank has more minerals' in it When built up shows in Humidifier Reservoir soak it in CLR Calcium, Lime & Rust Remover while at work [If ...