what you need to know: deep water culture system for hydroponics - The Indoor Nursery (2022)

  • Brody Hall
  • Apr 24, 2022
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If you’ve been thinking about setting up a hydroponics system in your indoor garden, deep water culture is one of the more simple systems that individuals can manage themselves to grow food or plants inside.

what is deep water culture?

what you need to know: deep water culture system for hydroponics - The Indoor Nursery (1)

Deep water culture is when you grow your plants in a reservoir of water that has an air pump to oxygenate the growing environment. It’s different from growing plants in a vase or jar of still water: without the air flow, water must be changed regularly so it stays oxygenated. Plants will deplete oxygen from the water unless there is a regular supply of air running through it. Similar to too-compacted soil, if there’s no oxygen, the plant’s roots can’t breathe.

In addition to oxygen, water must have nutrients for the plants to absorb. When plants are grown in soil, the material provides nutrients as it is leached by water over time and absorbed by the plant’s roots. Water itself has no mineral or nutrient quality, so we need to provide those to the plants with liquid fertilizer. We have to do this more frequently than when fertilizing soil, so although hydroponics is less messy, it requires more attentive care. This care is worth it, though, because growing your plants in a deep water culture system is a really interesting and productive way to grow your plants! There are different setups you can choose from, with different uses for the system.

what deep water culture can be used for

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Deep water culture is a great option because it doesn’t use any soil, there is a lower chance of pests, and plants can grow more quickly in water-based systems. You can do everything in a deep water system that you can in soil:

  • grow food
  • grow houseplants
  • propagate clippings
  • start seeds


One of the main uses of deep water culture hydroponics is for indoor food production. You can grow lettuce, herbs, tomatoes, root vegetables, and many other kinds of products on shelves, rows of beds, or single units.


There are many ways to grow houseplants with hydroponics, but deep water is an especially great choice for tropical plant species that love moisture. Certain kinds of plants like higher moisture levels than others, and these will do the best in a hydroponic system. Monsteras, peace lilies, pothos, and other water-loving species are good choices if you want to go soilless.

(Video) Deep Water Culture (DWC) Hydroponics System Tutorial


Any plant that can be propagated in water from a clipping can be raised in a hydroponic system as well. Putting the propagation in a net pot with sphagnum peat moss, coco coir, or Leca will have your sample sprouting roots in no time.


You can use rock wool cubes and coconut coir or Leca to set seeds in net pots to grow starter plants, then transfer them to a more permanent hydroponic setup or to a soil-filled pot!

the difference between water roots and soil roots

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When roots grow in water, they have a different structure than those that grow in soil. Water roots are more numerous and thinner, since they aren’t supporting the weight of the plant and nutrients are available in abundance at all times. It takes time for soil materials and solid fertilizers to release their nutrients with successive waterings. Due to the lack of soil and carbon material in water, the roots are white, rather than a shade of brown.

In soil, roots are fully buried so they can reach around and absorb as much water as possible. When grown in water, however, roots shouldn’t be totally submerged. In both cases, the roots need some air. In soil, pockets of oxygen within the dirt deliver air to the roots, and in water systems, the upper roots and all of the stem should be kept dry.

To be sure the roots aren’t completely under water, and due to the lack of structure from the water, plants grown in tanks or containers need to be secured in one way or another. This is usually done either by the use of net cups in the lid of the reservoir, or by being tied to the edge of an open tank.

maintaining your deep water culture system

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Keeping your growing environment clean is important for hydroponic systems. There are a few key maintenance steps to consider to keep your plants growing happily in their aquatic homes.

(Video) How To Setup a Hydroponic DWC Deep Water Culture System

pH balance

Most houseplants like a soil acidity range of 5.5 to 6.5, and this remains true when water is the growing medium. You can test your water periodically with a meter, pH strip, or liquid samplers to be sure it isn’t getting too acidic or alkaline. Like in soil, too high or too low of acidity makes some nutrients unavailable and others toxic.

fertilizer balance

Since water doesn’t contain nutrients on its own, all hydroponic systems need liquid nutrient solution to be added for the plants to get their essential nutrients. Like the oxygen in the water, nutrients will be depleted over time, and need to be supplied regularly based on the type of plant you’re growing. The parts per million (or PPM) for your unit’s water content and the plant type will define how much fertilizer should be present at a time.

water temperature

The water temperature needs to be monitored as well, although if it’s indoors, chances are your room’s ambient temperature is sufficient, about 68 to 70 degrees Fahrenheit. When the temperature starts getting higher, oxygen evaporates from water more quickly, and when the temperature gets too low, it can signal to the plant to enter dormancy. A thermometer for the water can help you keep on top of the temperature.

water quality and tank cleanliness

Circulating water helps keep it clean, so the air pump is not only oxygenating the water, it’s preventing stillness that leads to algae or bacterial growth. Plants absorb the fertilizer that you add to the water, but if you add too much, it can promote growth of algae or bacteria as well. Water should be changed periodically, based on the size of your setup and the needs of the plants, to be sure nothing is allowed to build up for too long. The water will also need to be changed periodically to maintain the water level.

what you need to know: deep water culture system for hydroponics - The Indoor Nursery (6)
(Video) Deep Water Culture for Beginners - Hydroponics made easy

growing houseplants in an aquarium

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Plants can be grown hydroponically in a fish tank, which has an air pump and source of nutrients. The plant roots can be partially submerged and will absorb the nitrogen and other nutrients from the fish waste, cleaning the tank’s water. Like a hydroponic system, the pH has to be balanced, and freshwater fish tend to like a tank of 6.5 to 7.5, the lower end of which is comfortable for many houseplants.


should I use a plastic or glass container?

A plastic container or a bucket makes a great hydroponic systems to grow food or houseplants, but you should only use food-grade plastics. These have the recycling number 2, 4, and 5, while 1, 3, and 6 should be avoided. Non-food grade plastics can contaminate the water and affect the health of the plants. Glass tanks offer good resilience, but may be heavier and more difficult to clean than plastic ones (unless you have fish, which builds an aquatic ecosystem that filters the water). It’s advised, however, to use dark tubing for your air pump if possible since the lack of light will decrease algae growth in the tubes, which can be hard to clean out.

(Video) Hydroponics Using the DWC Deep Water Culture Technique: An Introduction for Newbies

does hydroponics lower the potential for pests and disease?

Without soil, the chances of certain pests are lower, but it’s not impossible. It doesn’t eliminate the potential for aphids or mealy bugs, which live on stalks and leaves to feed on a plant’s sap, or fungus gnats, which might grow if there is mildew present from too much humidity. Plants can still get root rot in water if the roots are too submerged and get no oxygen. Problems related to nutrient deficiency can occur if the water isn’t supplied with a nutrient solution for the plants, and mildew can grow on or around the plants if the area is too humid.

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what you need to know: deep water culture system for hydroponics - The Indoor Nursery (8)

Brody Hall

(Video) Where Should You Place Your Net Pots in a Deep Water Culture System?

From managing a vineyard, studying horticulture, to obtaining a Bachelor’s Degree in Environmental Science - Brody loves nothing more than taking his agricultural experience and ecological scientific knowledge and applying it to the exciting world of indoor plants.


What is deep water culture hydroponics system? ›

Deep water culture (DWC) is a hydroponic method of plant production by means of suspending the plant roots in a solution of nutrient-rich, oxygenated water.

What is needed for deep water culture? ›

All you need is a 3 ½ gallon (13 L.) bucket, 10 inch (25 cm.) net pot, an air pump, air tubing, an air stone, some rockwool, and some expanding clay growing medium or the growing media of your choice.

How do you set up a deep water culture hydroponic system? ›

How to Build a Deep Water Culture Hydroponics System - YouTube

How do DWC systems work? ›

A DWC system dangles net pots holding plants over a deep reservoir of oxygen-rich nutrient solution. The plant's roots are submerged in the solution, providing it with perpetual access to nutrition, water, and oxygen. Deep water culture is considered by some to be the purest form of hydroponics.

What are the best nutrients for DWC? ›

Nitrogen, Phosphate, and Potassium (aka the NPK ratio) are the three best DWC nutrients for plant growth.

How often do you add nutrients to DWC? ›

Therefore, every 1-2 weeks (generally the longest you should wait before changing your nutrient solution is three weeks), you should remove your plants from the reservoir to replace and refresh the hydroponic nutrient solution, then place the plants back in the reservoir.

How do you mix nutrients for DWC? ›

How To Mix a 3-Part Hydroponics Nutrient Solution - YouTube

How do I set up an indoor hydroponic system? ›

The Hydroponic Setup Process - YouTube

How much air should be in a deep water culture? ›

The answer to that is surprisingly simple - as a rule of thumb the air pump needs to supply: 1 litre of air per minute for every 4 litres of nutrient solution.

How often do you change DWC water? ›

How often should I give new nutrient water to plants growing in DWC? You can change your reservoir water for new nutrient-water every one or two weeks, but in the meantime they need to have the reservoir topped off with pH'd nutrient water at 1/4 strength.

What is the difference between hydroponics and DWC? ›

Deep water culture hydroponics or raft system is the method of growing plants by completely submerging the roots in nutrient solution. Deep water culture is a different form of water culture in hydroponics. It's called raft system as the plant float on top of water in a raft like system.

How deep should roots be in hydroponics? ›

The solution should be deep enough to contain and supply nutrients to the lower plant roots. For example, lettuce plants in 3-inch-deep pots should have no more than 1/16 inch at the bottom of their pots protruding into a nutrient solution about 5 inches deep.

How long do you flush DWC? ›

Deep water culture (DWC) and other hydroponics growers should flush the shortest time, only 1–2 days, because you're immediately cutting the plants off from nutrients.

What pH should my hydroponic water be? ›

Nutrient solutions used for soilless culture should have a pH between 5 to 6 (usually 5.5), so the pH in the root environment is maintained between 6 to 6.5. This is the pH range at which nutrients are most readily available to plants.

How often do you change DWC water? ›

How often should I give new nutrient water to plants growing in DWC? You can change your reservoir water for new nutrient-water every one or two weeks, but in the meantime they need to have the reservoir topped off with pH'd nutrient water at 1/4 strength.

What is the difference between Kratky and DWC? ›

The Kratky method is basically the Deep Water Culture, but the difference is that it doesn't have a pump and the pots must be 50% exposed to the air and the other 50% below the lid; this is done so the roots can obtain the oxygen from the part that is exposed to the air.

How deep does DWC need to be? ›

To answer our question, Deep Water Culture System, alias DWC is a method of growing plants where the roots are suspended in a nutrient-rich, oxygenated solution. It is referred to as 'deep' since the water should be at least 10-inches deep.

What is DWC full form? ›

Double Wall Corrugated ( DWC ) HDPE pipes are similar to normal HDPE pipes except that they have different external & internal surfaces which gives them additional strength and stiffness. These are made with High Density Polyethylene which has very high life expectancy.


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