It is back to Nature. The raw material is basalt rocks and chalk. These are melted at 1600 C°. The lava is blown into a spinning chamber, which pulls the lava into fibers, much like ‘cotton candy’. When Mother nature makes this wool we call it ‘angel hair’. If you have ever visited a volcano, you may have seen the fluffy angel hair flying around.

Stonewool products are made from basalt rocks, which come from the Earth. Stonewool is composed roughly of the following elements:
46% Silica, 16% Calcium, 14% Aluminum, 1% Magnesium, 8% Iron, 2% Sodium, 1% Titanium, 1% Potassium, and 1% Manganese (Source: Cultivos vegetales en substratos C.T.I.F.L.) In the production process, a biologically derived binder is used and some lime stone which can leave some lime residue on the surface of the fibers.

Mimicking Mother Nature's production of "angel hair" during volcanic activity, the Grodan Stonewool manufacturer heats rocks to 1600°C, to create lava. The lava is blown into a spinning chamber, which makes fibers similar to cotton candy. These fibers are bagged loosely as "Stonewool granulate". They are also packed into mats, from which Grodan cubes, blocks and slabs are cut. The products make excellent use of natural resources: one cubic yard of rock becomes 37 cubic yards of wool!

The fibers are packed together into a mat and cut Grodan slabs & cubes from it. The stonewool granulate is bags with little flocks of 'angel hair'.

Grodan stonewool was developed in Denmark in the early 1970's.

• Today most Grodan is pro-duced from recycled Grodan.
  
• Grodan stonewool is the main reason that most of the worlds greenhouse vegetables are now grown hydroponically.
  
• At full saturation, Grodan holds 80-90% of its volume in water. It is wrapped in biodegradable plastic and the stonewool can be re-used in your garden to improve the aeration and water holding capacity.
  
• Grodan stonewool went into space on Challenger in 1986 and is still being used in NASA's testing with hydroponics.
  
• You will also find Grodan products at the EPCOT center / Walt Disney in Florida
  
• You will find Grodan stonewool in some garden centres and in virtually all hydroponics shops in North America.

Coconut fiber contains approximately 75% water and 25% air - an ideal ratio for almost any culture. This capacity to hold water makes the medium particularly suitable to root cuttings.

Coconut naturally buffers pH which means that all the elements required for the plant's healthy growth are readily accessible to the plant.

Hydroton is our trade name for "expanded clay," a lightweight gravel which is manufactured specifically for hydroponic cultivation. Our supplier is Jongkind in Holland, the source of the finest quality expanded clay in the world. This media is the first choice for many commercial Dutch growers specializing in flower and vegetable cultivation. Not to be confused with many other kinds of expanded clay which look similar but which are often toxic, Hydroton is pH stabilized and releases practically no minerals into the nutrient stream; in other words Hydroton is almost completely inert - except for offering excellent moisture and oxygen capacity to stimulate healthy root development.

Vermiculite has been used in various industries for over 80 years. It is used in the construction, agricultural, horticultural, and industrial markets. Vermiculite is the mineralogical name given to hydrated laminar magnesium-aluminum-ironsilicate which resembles mica in appearance.

Vermiculite is found in various parts of the world. Locations of the predominant commercial mines are in Australia, Brazil, China, Kenya South Africa, USA and Zimbabwe. Vermiculite mines are surface operations where ore is separated from other minerals, and then screened or classified into several basic particle sizes. When subjected to heat vermiculite has the unusual property of exfoliating or expanding into worm-like pieces (the name vermiculite is derived from the Latin 'vermiculare' - to breed worms).

This characteristic of exfoliation, the basis for commercial use of the mineral, is the result of the mechanical separation of the layers by the rapid conversion of contained water to steam.

Mined then kiln dried and made into small rocks, similar to hydroton but has silica and mineral value. It is 100% organic, and will promote finner, bigger, and healthier roots. It comes in 20 Liter bags. Can be used by itself, or mixed with other mediums like rockwool, coco, or soil to create custom mix. As with all mediums, you need to soak or wash the rock to get all the dust and particles off to create a more clean and stable medium.