The growing media is the structural support for the plants you will be growing.  As the plants grow their roots they will also grow and support themselves in the growing media you use.

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There are several different options to use for Hydroponics and Aquaponics.  If you are using a system utilizing net pot for draining of the water the growing media must be larger than the holes in the net pots.  This is to avoid the growing media to drain out of  the net pots into the liquid supply.  To avoid this along with providing structural stability for the roots we recommend using clay pebbles (Hydroton) or sometimes called light expanded clay aggregate (LECA).

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Clay pebbles range in size but are around 1/2" round.  This allows for easy drainage and many spots for the roots to grow into.  For our Aquaponics and Hydroponics systems we recommend using the clay pebbles as other media can get into the main liquid supply and clog pumps.  

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When using the clay pebbles for the first time it is important to clean them before introducing them into the system because they carry a lot of dust and can make the water dirty.

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Growing media used for microgreens can be soil or soil-less.  Some types of pants will only grow efficiently in soil, such as, carrots.  Most other microgreens can be grown efficiently on a fiber mat.  At Nomis Engineered we supply the Grodan Cress Plate as we have achieve the best results with this product with the least amount of issues.