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RGJ Hydroponics division specialises in hydroponic systems for your home, farm and business.
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The Importants of Ph
The Importants of PhPH stands for Potential Hydrogen. All Hydroponic nutrient solutions need to be kept at the proper PH if they are to be used by the plants.
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Hydroponic Growing MediumsThere are many Hydroponic growing mediums that plants will thrive in provided they are used correctly in conjunction with the other aspects of the Hydroponic growing system
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RGJ Power offers you detailed descriptions of the types of hydroponic growing meidiums so you can choose the best option for your hydroponic system...
  • Hydroton
  • Rook Wool
  • Coco Peat
  • Net Pots
  • HayDite
  • Perlite & Vermiculite


  • Start with our Introduction to Growing Mediums below....
    Introduction to Growing Mediums
    In Hydroponic gardening there are several choices for Hydroponic growing mediums. The choice for a proper Hydroponic growing medium is a very important factor if we want optimum conditions for plant growth. Hydroponic growing medium must do several things including support for the plants and appropriate distribution of oxygen and carbon dioxide. Roots need oxygen and they respire gasses such as carbon dioxide so it is very important to have plenty of air in the root system.

    A good hydroponic growing medium will allow maximum water availability to the roots, must drain well, have good nutrient and moisture holding capabilities until the next feeding and not break down quickly over time. In Hydroponic gardening, how the Hydroponic nutrient solution is going to be applied and how often it will be applied has a direct impact on which Hydroponic growing medium you should use.
    Net Pots

    In Hydroponic gardening many Hydroponic growers use net pots to grow their plants in. Hydroponic net pots allow for very fast flooding and filling with Hydroponic solutions. They come in many sizes and can be used in NFT, Top Irrigation, Aeroponic and Ebb and Flow Hydroponic systems and work great in most Hydroponic applications.

    Some of the Hydroponic growing mediums used in net pots are hydroton, lava rock, stones, rock wool and any Hydroponic growing medium that will not fall through the holes. This would eliminate Hydroponic growing mediums such as sand, perlite and smaller size particle growing mediums. You could also use coco peat in these pots if you were to use the longer strands of the coco peat and not the smaller particles that would fall out of the holes fouling up your Hydroponic nutrient tank.
    Roots and Net Pots

    With Hydroponic net pots you will get a lot of roots spreading and dangling out of the pots. Sometimes this can cause a problem when moving and relocating the Hydroponic plants to other locations or hydroponic systems. If you do not plan to never relocate your Hydroponic plants net pots will work just fine for most Hydroponic growers.

    Plant roots can sometimes be damaged by using sharp edged Hydroponic growing mediums that can cut into the plant roots. This can be very detrimental to the plants. This is a advantage of using hydroton, is has smooth round edges which is better for plant roots in Hydroponic systems. You still have to be careful relocating them though especially if you are using net pots. The dangling unprotected roots can be easily damaged.
    Hydroponic Growing Mediums Available

    There are several Hydroponic growing mediums that hydroponic plants will thrive in provided they are used correctly in conjunction with the other aspects of the Hydroponic growing system.

    Each Hydroponic growing medium has its own advantages and disadvantages depending on how you are doing your Hydroponic gardening. All should be washed well in at least hot water before use for better results and to remove dust and debris and help to stabilize Ph.

    RGJ Power has compiled a list of hydroponic growing mediums on the market today and provided intense descriptions, details such as Ph manipulation, pros and cons and if the hydroponic growing medium is environmental friendly or not
    Hydroton

    Hydroton are expanded clay balls that have been heated at temperatures of 1200 degrees or more and have very high capillary action that has been proven to accelerate plant growth when used correctly. Hydroton is a good choice for many Hydroponic systems as it is a completely ecological friendly Hydroponic growing medium that is inert, PH stable, very porous, and provides lots of oxygen to the root zone of the plants. It is a reusable Hydroponic growing medium that drains freely and does not compact.

    Hydroton can be used in NFT, Top Irrigation, Aeroponic and Ebb and Flow Hydroponic systems with great success. It does dry out quicker than other Hydroponic growing mediums. In a Hydroponic Ebb and Flow system It needs to be flooded about every 2 to 4 hours or about 4 to 8 times per day at flood times of about 5-15 minutes each depending on the size of the plants. Hydroton is a good choice for Hydroponic growing and it usually comes in 10 or 50 litre bags. We thoroughly wash our Hydroton in a hot water solution of about 3 gallons of water with about 2 to 3 cups of 3% hydrogen peroxide and then rinse in plain hot water. This removes any impurities and dust and gives it a stable PH.

    Pros : use in almost all Hydroponic systems.Environmental friendly

    Watering : Needs to be watered about 4 to 8 times a day or every 2 to 4 hours as it dries out rather quickly. If mixed with coco peat it stays moist much longer.

    Benefits to Plants : Provides lots of oxygen to the root zone and some plant support.

    Reusability : Wash hydroton in a 10% hydrogen peroxide solution in hot water and rinse well.
    Coco Peat

    Coco fiber or coco peat, which is made from the husk of the coconut, is an excellent Hydroponic growing medium. It has millions of capillary micro sponges to readily absorb and slowly release the Hydroponic nutrients as well as allow plenty of oxygen and aeration of the root zone of Hydroponic plants. Coco peat has a natural Ph of 6.5 to 7.0, can hold up to 8 times it's dry weight in water and also has some anti fungal properties that helps plants get rid of soil born diseases.

    The spongy porous texture of coco peat promotes rapid development of roots, allows for exchange of gasses like carbon dioxide and lets Hydroponic solutions drain quickly. We have used a 50/50 mixture of coco peat and hydroton and not only do the plants thrive in it but the in between feeding periods are much longer due to the water retension of the coco peat. Coco peat can be mixed with other Hydroponic growing mediums as well to improve their water holding properties.Each Hydroponic growing medium has its own advantages and disadvantages depending on how you are doing your Hydroponic gardening. All should be washed well in at least hot water before use for better results and to remove dust and debris and to help in stabilizing the Ph level.

    Pros : Works great either alone or mixed with other Hydroponic growing mediums in almost all Hydroponic systems. Holds nutrients longer than almost any other Hydroponic growing medium. Environmental friendly

    Watering : Needs to be watered about 3 to 5 times a day or every 3 to 5 hours

    Benefits to Plants : Provides lots of oxygen to the root zone.
    Rock Wool

    Pros & Cons : Works great for seed starting and when transplanted into other Hydroponic growing mediums. The fibers and dust in rockwool are definately bad for your lungs and can be irritating to the skin. Rockwool does have a high Ph and it can fluctuate. Not Environmental friendly

    Watering : Only needs to be watered 1 to 5 times a day depending on what you are growing.

    Benefits to Plants : Holds water and nutrients the longest and has fairly good oxygen levels at 18%.

    Availabilty : Comes in 1" cubes to 3 foot long slabs and many other growing sizes in between.
    Lava Rock

    Pros & Cons :Works very well in Hydroponic systems and provides good water holding properties and plenty of oxygen to the root zone. Environmental friendly

    Watering : Needs to be watered about 3 to 5 times a day or every 3 to 5 hours depending on what is being grown.

    Benefits to Plants : Provides good plant support.

    Reusability : Should be sterilized with a 10% bleach solution and rinsed well or 1 hour in oven at 250 degrees when new and in between crops because of the numerous pores harboring possible detrimental fungi.
    Haydite

    Haydite is a form of expanded shale. Haydite is used to make lightweight concrete.

    Pros & Cons : A little hard to find but well worth it if you do. Makes an excellent Hydroponic growing medium. Environmental friendly

    Watering : Need to be watered 3 to 5 times a day or every 3 to 5 hours.

    Benefits to Plants : It provides lots of oxygen to the root zone and has good water retension as well as good support for the plant.
    Perlte & Vermiculite

    Pros & Cons : Both of these can be used as Hydroponic growing mediums but only in limited applications. They both float so they cannot be used in Ebb and Flow Hydroponic systems. They both provide plenty of oxygen to the root zone. They can be used in Top Drip Hydroponic systems as well as in NFT systems if the right pots are used. They cannot be used in most net pots as they will fall through the holes. They do not provide very much support for the plant. Environmental friendly

    Watering : Needs to be watered about 3 to 5 times a day or every 3 to 5 hours depending on what is being grown.

    Benefits to Plants : They both can be used as part of a Hydroponic mix for more oxygen to the root zone and moisture holding properties.




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    Hydroponic Systems
    Hydroponic SystemsView the different types of Hydroponic systems on offer from RGJ Power....
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    Nutrient Solutions
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    Starting Seedlings
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