wrote in message
I'm thinking a filter that filters out
"sediment" or the stuff that becomes sediment. I run the A/C the rest
of the year and don't have an excess dust problem during A/C use.

Ed S.
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A filter will take out any sediment, but the real problem is the dissolved
solids in the water that remain behind when it evaporates. You need a
softener or RO system to take them out.