Water up to 9 trees, 3 at-a-time. As the reservoirs empty they can be moved to other trees where injectors are installed. The Versa-Fill design lets you fill effortlessly with a hose or trailer tank. Check out the Fill-N-Haul system for remote trees. Tree I.V. is industrial strength and will withstand abuse from string trimmers and lawn mower debris. One application soaks the root-well of small trees. Tree I.V. can be moved out to the drip line of larger trees, promoting outward root development. Watering bags cannot do this. Built in the USA with quality and durability second to none!