Hydroball is very porous hence acts as a home for bacteria that are naturally present to nitrify water or you can say clean water. Hydroball has a large surface area for its volume hence acts as probably the best aggregate to bio-filter in any aquatic system. All aquatic systems need very large biological surface areas to hold the bacteria to perform there tasks.
Sand as a growing medium in any hydroponic system is not good as it has a very low void ratio so inhibits water flow and holds/retains biomass whereas hydroball has a large void ratio and hence allows better flow of water through the systems ensuring less chance of clogging. Hydroball also retains water so is effective for flood and drain grow beds. Hydroball is loose and light and this makes it very easy to plant plants.
Beautiful ornamental showpieces can be made up using a simple pot/dish housing hydroball. A glass pot with a plant planted inside the pot gives the viewer a view of the root structure as well.
Hydroball has been used in the civil construction industry for a very long time and is used primarily for its light weight and very good thermal and sound insulation properties.
Hydroball is a Lightweight Expanded Clay, formed by the heating and firing of clay in a rotary kiln, at temparatures up to 1150°C. The process transforms the clay into various lightweight ceramic balls, which have a hard ceramic shell and a porous core. The porosity is what gives Hydroball its ability to retain water for long periods of time in dry climates.