Vitalink Clay Pebbles 45LVitalink Clay Pebbles 45L Totally inert = stable EC and pH Unique irregular shape and porosity which increases their surface area Reduced dust compared to regular pebbles VitaLink Clay Pebbles offer strong structural integrity and enable good root aeration and development. They have a lower bulk density than clay pebbles of other brands, which means they are more porous and have a better ability to retain water. Our pebbles are also irregularly