Exo Terra BioDrain Terrarium Draining Substrate is a natural, non-organic substrate that allows excellent drainage of the terrarium. It will not rot or decompose like other natural substrates. The optionalBioDrain Terrarium Draining Meshwill keep the BioDrain Terrarium Draining Substrate separated from the decorative terrarium top-layer substrate and prevent the different substrates from mixing and contaminating the water. The BioDrain Terrarium Draining Substrate will function as a biological filtration system. The clean terrarium water can then be circulated inwaterfalls, theExo Terra Rain Systemor Dripping Plants. UseBio Clean(formally known as Biotize) to speed up biological filtration capabilities.