Im in a hard water area and dont have an RO filter as of yet!, Could i get away with a 5 micron filter to supply my humidifier and not get limescale covering the grow room??.
Cool mist humidifiers are fine, but they do get build-up. The thing is, the fine mist spray they put out absolutely will leave deposits if you're using tap water or other hard water sources. That's what I understood the OP to be asking about. I'm talking about the home use humidifiers.
yeah ive only got tap water for the moment, Spent far too much on the set up so dont have any spare change for an RO unit. One plus is my opticlimate will produce RO from the condenser outlet so i will use this to top up the humidifer as much as poss