Originally Posted By: 440Magnum
Water from HVAC or a dehumidifier can have tons of dust, pollen, mold, etc. in it, because all the crud in the air sticks to the wet coils and then gets dripped off into the collection pan.
I know--note that I was the one who pointed out that fact in my earlier post.
For coolant use, running it through a coffee filter will be fine. People who think the water needs to be even cleaner are too picky.