Summary:In this system, the grow tray is flooded with nutrients and then drained back to the reservoir.  A timer is set to perform the action multiple times a day. The timer can be adjusted depending upon the size and requirements of the plant. Humidity and temperature play a role in setting the timer.

Pro: Versatile, can be used with a variety of growing medium.

Con: With some types of growing medium, there is a vulnerability to power outages, pump, and timer failures. This can be resolved to some extent with growing media that retains more water.