Three system cooling maintenance in suwannee. Arrived on site, changed filters and cleared drain lines, checked electrical connections, amp draw, and capacitance cleared outside coils and checked pressures found upstairs system without secondary water safty switch, recommend installing to protect electrical systems from water damage. Also recommend installing surge protection to each piece of equipment to protect electrical systems. Used the last of filtration media for PureAirX. Installed overflow switch and supplied customer with (1 box(4 uses)) PureAirX 16x25x1 media. All units are operating normally at this time.