Produced through volcanic activity, Zeolite is a very porous mineral used in industry as a filtering agent for water, as a stockfeed supplement and in horticulture as a soil additive. 

Due to its porous nature, each particle has a large surface area, enabling what is known as 'cation exchange' to take place. This means that Zeolite can hold and exchange nutrients required by plants, making nutrients readily available.  Zeolite is not a fertiliser; it works to make fertilisers more efficient and reduce leaching of soluble nutrients. 

It can be worked into the top 100 - 200mm of soil, or added to compost piles.  Use at a ratio of approx. 250 - 500gms per square metre, add to compost at a ratio of approx. 10kgs/m3.