What Is Ebb And Flow Hydroponics?

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The ebb and flow system also called a flood and drain system. This is one of my favorite methods of hydroponics due to its ease of use, capabilities, and reliability. With the right system, you can customize an ebb and flow system to grow just about any type of plant with success.


How Does An Ebb And Flow Hydroponic System Work?

The grow tray of an ebb and flow hydroponic system is slowly flooded with nutrient solution. This provides the plants with the nutrients they need. The amount of time it takes for grow tray to fill is controlled by the rate of flow from the reservoir. When the hydroponic solution is then drained when it reaches a certain level or after a set amount of time. As the nutrient solution drains from the grow tray it allows oxygen to the root system. The process is then repeated over again. This constant flooding and draining provide your garden an abundant amount of oxygen and nutrients that promotes fast, healthy growth.

Ebb and Flow Hydroponic System

Different Ways Ebb And Flow Systems Can Drain

Ebb and flow hydroponic systems can drain in a couple of different ways. In some ebb and flow systems,  the grow bed is flooded until the nutrient solution reaches a certain level. At that point a standpipe allows water to flow down a drain tube back into the system’s reservoir. The pump is usually set up on a timer to run for a certain amount of time and when that time is up, the water stops flowing, it drains back down the pump, draining the grow bed. After a set amount of time, the timer kicks the pump back on and the process is repeated.

Draining the systems automatically involves using a bell or loop siphon. Using one of the this “automatic” drains on your ebb and flow system allows you to run your pump 24/7, so there’s no need to use a timer. A loop siphon is a tube that is looped on the outside of the system and leads to the reservoir. When the water completes the loop it creates as vacuum, pulling the water from the grow tray and draining it until the air in the tube cuts the vacuum. Creating a bell to go over the standpipe drain of your system is also a method of creating a vacuum to drain your system. As the water goes down the standpipe and hits an elbow it creates a vacuum draining the system. When water breaks the vacuum, the system fills again.

What Grow Medium Works Best In Ebb And Flow Hydroponic Systems

There are a few different factors that you should consider when choosing a grow medium for your ebb and flow system.

Water retention– Ebb and flow systems work best with grow mediums that retain some moisture but drain well. Lava rock and hydroton clay pebbles both have these characteristics.

If you’re growing root vegetables– Root vegetables will need to be able to push grow medium to form a mass. Hydroton is more suitable for this than lava rock. Other grow medium like a vermiculite/ perlite mix also works well with root vegetables. Remember that you will need a deep grow bed to allow a solid root mass to have room to form.

Weight/ buoyancy- Your grow bed should be strong enough to hold the weight of your grow medium and water. Since your grow bed it being filled with water causing lightweight grow medium to float, disrupting the plant’s root system.

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