Ebb and flow irrigation has been used for many
years. It can be used with benches or floor
operations. Watertight benches, generally either
aluminum or plastic, are flooded with up to an inch
of nutrient solution as needed to keep the root zone
of the plants moist. This may be done once or twice
a week or several times a day depending on weather
and the size of the plants. Once the bench or floor is
flooded, the solution is allowed to drain back to the
storage tank by gravity.