With the WaterBasics Gravity Flow Filtration Kit all you need is two standard water containers to set up a gravity powered filtration system. The Kit includes WaterBasics GRN Line Emergency Filter with the convenience of Series II connectivity to easily connect to most standard water storage containers including jugs and carboys. Simply screw the GRN Line Filter directly into the threaded cap of the clean container, then connect the feed tube to the unfiltered water container. Place the unfiltered container higher than the clean container, give a few squeezes on the primer bulb to start the water flow, and then sit back and let Newton do all the work for you. In about the same time as it takes to make a lemonade and kick your feet up, you can have a gallon of filtered water with GRN Line Protection from chemicals, bacteria and protozoan cysts. You can depend on WaterBasics.