This SPACE SAVER SYSTEMis also called EBB & FLOW, EBB & GROW, MULTIFLOWor FILL & DRAIN they all do the same, simply fill yourgrow sitesfrom the bottom up then drained back out. This simply moistens all the roots in each grow site automatically controlled with a timer, water levelfloat switches & 2 circulating pumps at 317 GPH.Comes with6 grow sites consistingof 3/4\" fittings, 2-1/2 gallon bucketsin bucket, allowing the roots to grow down allowing more OXYGEN to the roots. Each innerbucket with holes in the bottomwill hold 5 lbs. (5 liters) ofLECA (light Expanded Clay Aggregate)(NOT INCLUDED)The Brain bucket controller with a 317 GPH pump,three 3/4\"outlet fittingsto grow sites with 3/4\" fittings.Has color coded tubing Blue for draining and black for filling connecting the pumps to and from the Controller/Drum Reservoir, the highestwater level thewaterreaches is approximately 9\" from the bottom of the grow siteup4/5 of thegrow site.When theFILL CYCLEof the system starts,the green light goes on notifying you not to add any fluidsto the Drum Reservoir during this cycle. When the Fill cycle is over the green light will shut off automatically. This green light will not interfere with your dark period during theflowering stage. The draincycle is always on when the fillcycle is off.You program the Controller at 15 minutecycleswhen you want the fill cycles.The (Reservoir is a (17\"D X 26\"H) 15 gallon Heavy Duty Refurbished BlueDrum) with a 317 gallon per hour pump on the bottomattached toa black tubewith anti-syphon clipon the lid ofthe drum .This system comes complete with INSTRUCTIONS, 15\' OF 3/4\" TUBING, 3 EACH 3/4\" ELBOWS,3 EACH 3/4\" TEES PLUS THE6 GROW SITES, CONTROLLER AND DRUM WITH ANTI-SYPHON CLIP FOR FILLING AND DRAINING INTO THE DRUM. THIS SYSTEM IS EXPANDABLE UPTO48 GROW SITESIF YOU GET A BIGGER DRUMALL NUTS & SCREWS ARE BRASS WHICH DO NOT CORRODE LIKE STEEL IN GROW ROOMS.THE INSTRUCTIONS WILL HAVE MY E-MAIL &TELEPHONE NUMBER FOR FURTHER SUPPORT IF YOU NEED IT.