F&d beds are filled to a point that activates the bell syphon. This system is most suited for aquaponics. Once the bell syphon is activated, all of the water is sucked out of the grow bed.
Diy sump tank for aquaponica system
Diy aquaponics clarifier 55 gal barrel
Diy aquaponic kitchen garden
Flood and Drain Aquaponics HowtoAquaponic Backyard aquaponics
Web simple aquaponics system flood and drain:
In short, if the volume of your fish tank is the same as, or higher than the volume of your growing container, you shouldn’t need one.