Window Farming is an easy hydroponics method in which you can grow herbs, lettuce and even small fruits indoors, year round!
The system uses up-cycled PET bottles, a few parts from the aquarium supply shop, an electric timer, and sports ball needle.
This is a closed loop system, meaning that water from a storage tank gets circulated up to the top of a tower. It then trickles down through each pot, finally arriving back in the tank. There is very little water loss in this sort of system.