What are Grorox?

Grorox are used in hydroponics as a medium to support the plant. They are chemically inert, do not affect pH and provide excellent drainage. They are made from a special type of clay which is heated to a high temperature causing it to pop like popcorn.

What is Cocopeat?

Cocopeat is an organic medium made from coconuts, frequently used in both hydroponics and seed sowing mixes. Its advantages are that it is lightweight, relatively inert and comes from a sustainable source. However, cocopeat comes in various grades, and can actually be detrimental to plant growth if it contains salt water residues from poor processing.

What is rockwool?

Rockwool is a substrate made by melting rock, extruding it in threads and then pressing it into sponge-like blocks.

What is the difference between Grorox and Cocopeat? What are their applications?

Both GroRox and Cocopeat are pH neutral media. GroRox provide free drainage and aeration, while cocopeat provides moisture retention and the ability to hold onto a small amount of nutrients.

Do the rooting media (Grorox, Rockwool, Cocopeat) change the way nutrients are used?

They can. Rinse the growing media (especially important when using Rockwool) before using it. We suggest you check the nutrient solution pH and ppm(see above) and adjust the solution accordingly.

How big does a brick of Cocopeat become?

One brick expands to approximately two and a half gallons.

Can you recommend a simple solution for keeping particles of smaller growing media from getting into my nutrient solution?

General Hydroponic' s PolyWool was designed to do just that. PolyWool also creates a unique air and moisture balance around the net cup.