Biogreen Hydrorocks are an ideal basis for hydro culture.
the most clean and ph stable clay pebbles on the market , these pebbles are ready to use having already been washed to a very high standard
Hydrorocks allow your plants to grow healthily and provide the roots with a good grip.
Hydro rocks are a great source of media to be used on there own in systems such as flood and drain or can be mixed with a number of other media to give additional aeration,
Highly recomended to mix with coco at a 60/40 mix.
These pebbles really are the best on the market by all means.