Alien Hydroponics RAIN Silver SeriesThe ALIEN RAIN is the ultimate top feeding system which in the kit version sits on the floor of your grow room. An automatic sensing Swedish water pump returns the nutrient solution back to the tank after feeding. The return pump is not needed for the table top set up. Gravity returns the nutrient solution to the tank. The RAIN System is entirely adaptable to suit any grow room and can also be used as a table top set up without the need for a return