That foam crap always gets either mold or lime build up. Unfurtuanetly your only option is too keep changing it regularly. Depending on the size I would use fish tank filter ei. Whisper boi pads wth the charcol. I actually suggested this too a b&m and installed it and they have no problems at all now
I don't think it comes from the water you use. I think it comes from the air cycling thru it. Big honking filter thing in the room humidifier has the same prob. Had one on the old furnace, too. Eliminized when we replaced the furnace, cause the filter in that got too yucky to handle too fast to afford.
How often do you actually pour out all the water and wash the tank out? I do it every 3-4 months and that keeps things running great. I'm going to check on the filters Lee, thanks.
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