Help! I can't hardly breathe, I am totally plugged up, my chest hurts & I an insanely itchy. I was going to move into a hotel then I thought of our Wait Skuttle furnace mount humidifiers. I took the screens out & they have huge white calcium like build ups on both & both bottom trays are full of mold. We have hard water. Is this our problem & if so how do we clean the filter & how often? Should we clean the trays & how often. We have been considering buying an air to air exchanger. Would this help & what is the best brand to buy? What should I be making sure the installer does for us. Thank you very much in advance. I am "so" looking forward to your reply.