Dual Flow has the unique ability to be used either as an EBB and Flow system or as a Nutrient Film Technique (NFT) system, simply by rearranging the components supplied within the kit. The Dual flow is manufacture from impact resistant 4mm thick ABS and are supplied pre-drilled and ready for use. In the Ebb and Flow mode, the system requires less maintenance and can be easily be left for several days without worry or adjustment. Once you have mastered this more forgiving method of hydroponics why not switch the Dual Flow to NFT mode and experience faster growth rates and have the ability to expand your system with an additional 4 trays. The Complete Kit includes: Dual Flow Tray, 40/80 litre Reservoir Tank, Correx Cover, Submersible Pump, Spreader Matt and all Drain Fittings/ Piping