Hi all, picked up a new trailer with built in tank but having trouble getting my ppm down! Filled the tank up (52ppm) and decided to just flush it through as the previous owner poured bleach in the tank to clean it for sale. However once its passed through the system its coming out really bad, water tested after pump but before filter - 558ppm water tested after filter - 286ppm. Now the filter definitely needs new resin but I'm wondering what I can do to clean the tank out as it is obviously contaminating the water? My thoughts were remove the old resin, stick a hose in the tank and turn it on for a few hose to just let fresh water flush out any crud... Any other suggestions?