FERTILIZER IRRIGATION SYSTEM FOR GREENHOUSES, THIS UNIT CONTROLS YOUR WATER QUALITY. THESE UNITS ARE USED FOR VEGETABLE GROWING, AS WELL AS FLOWERS, EC OR PH AND STRENGTH OF FERTILIZER IN 3 SEPARATE TANKS, CAN BE HOOKED UP TO YOUR COMPUTER, THESE UNITS ARE INSTALLED BY ZWART SYSTEMS IN GRIMSBY, MANUAL INCLUDED, $2500 CALL KEN 905-328-2454 NOTL...PICS ARE COMING