Which way makes sense to you? Less waste water? or longer lasting RO membrane elements? Vote below - Check out the piggy back kit on sale now thru 2/16 - show some love to a fellow reefer for valentines day!! Disclaimer: All RO/DI systems from AquaFX are made in house @ AquaFX HQ in Winter Park FL... never ever imported. Call today and speak with our on staff engineers with any water quality question.