ok guys i hope you can help. i was called to look at two 5 ton evaps (one luxaire one carrier) that have slime on them.

these a/cs take care of a paint lab at a diamond vogel paint factory. last summer the coils were slimed up bad. i removed them and pressure washed them and cleaned with a coil cleaner. this summer it is the same thing. the coils basically become completely blocked and the lab temp starts climbing.

they told me that the sinks will get the same kind of slime in them over the weekend when they dont run any water.

what i want to know is what can i do to fix this. i dont want to remove these coils every summer to wash them. what are my options? has anybody seen this? is their a specific chemical in the paint that is causing this???

i can get additional info if needed.