The flood and drain aquaponics system design is the most common for home use and also the simplest, which I’ll be going through in this article.
Bear in mind that this will be based on a media bed system, not a DWC (deep-water culture) or NFT (nutrient film technique).
The Flood And Drain System
Not only is the flood and drain aquaponics system design the easiest to build, but it’s also the easiest to understand, so it’s obvious that this is most suited towards beginners.
As you can see from the diagram above, it’s a very basic system and works well on a 1:1 grow bed volume to fish tank volume.
Here are the key points of a flood and drain system:
- The media-based grow bed is placed above the fish tank.
- Water is pumped up from the fish tank into the grow bed (either from the bottom of the bed if drained from the pump, or (A) above the bed). Ammonia rich waste is produced by the fish and accumulated in the water which the plants feed on.
- When the siphon trips or the pump is switched off by a timer (B), water returns to the fish tank by gravity (the plants filter the waste water and contains nutrients for fishes before returning to the fish).
The pros of this system are:
- It’s very basic to build and maintain
- It’s easily customizable
- It doesn’t require a sump tank (a low space used for collecting undesirable liquids or/and increasing water volume)
The cons of this system are:
- If you decide to customize your system by adding more grow beds, you will go from a 1:1 to a 2:1 bed to tank ratio. As a result, there will be too much water drained in every flood cycle from your fish tank unless you use an indexing valve. Low water levels could mean more stress for your fishes.
For a home use, a flood and drain aquaponics system design is the most suitable, especially if you’re just starting off. However, if you wish to increase your food output then you would need a more sophisticated system in place.
You would need another grow bed, add a sump tank and possibly reorganize the location of the various components in your system. If you want to learn more about this and different aquaponics system designs, I recommend that you visit here.
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