Mt Sylvia Diatom­ite P/L (MSD) is the leading producer of high quality diatomaceous earth (diatomite) in Australia. Our company is aimed at growth through exploiting the properties of this natural material by evidence based scientific research. All of our products are registered by the Biological Farmers of Australia (BFA) for use on organic farms. This means that they can be used in a certified organic entity without affecting the organic compliance of that entity.

If you would like information on Palagonite and Soil Conditioners visit our sister site Mt Sylvia Soli Conditioners it is a leading producer of high quality soil conditioners

About the Company

Mt Sylvia Diatomite is focused on the development of its diatomite products and the education of current and future clients in the uses of these products.




This is our insecticide product. A natural product registered with the Australian Veterinary and Pesticides Authority for use against insect pests of stored grain and registered as an allowable input for organic farmers by the BFA.

Beware, some diatomite products are being sold that use inferior grade diatomite inappropriately treated. This material has not been scientifically tested to establish efficacy.

For special purposes, we can make available diatomite rocks up to 25 cms across. These have been used in aquaponics, the production of sculptures and other diverse applications.

Diatomite Fines: <0.6mm

Our diatomite fines is the perfect product for stock feed supplementation. This food grade product has been used for many years by the poultry industry. Diatomite fines has also had a long and successful history of use with cattle, sheep, goats and alpacas as well as cats and dogs.

Granular Grade: 0.6-0.9 mm

Diatomite is supplied to the building industry in the manufacture of light-weight building bricks, blocks, tiles boards and sheets. It is used as an additive to cements, plasters, mortars and stuccos.

Nursery Grade: 0.9-2.0 mm

As the name suggests, the "Nursery grade" is very popular as an ingredient in potting mixes. It acts as a wetting agent holding water and slowly releasing it to the young seedlings. As importantly, it provides plant available silica to the young plant.



Kleensorb is calcined (super-heated) Diatomaceous Earth. Diatomaceous Earth is a sedimentary rock made up primarily of amorphous silica (see analysis). It is not crystalline silica. The heating process does not exceed the temperature necessary to convert amorphous silica to crystalline silica.

A blend of liquid molasses and diatomite in a dry powder form

Molodri is a blend of liquid molasses and diatomite (approx. 50% molasses by weight) carefully formulated in a special process which converts the molasses to a dry powder form for convenience. It is used as a feed attractant and appetite stimulant for cattle, horses, sheep, goats, pigs and poultry. The product is approved under ERA section 47 as suitable for pet, stock or aquaculture.

You will never want to use liquid molasses again.

Crushed and unprocessed Diatomaceous Earth


Purasil is raw Diatomaceous Earth mined from sedimentary layers deposited millions of years ago in a fresh water lake. It is light in weight, chalk-like in appearance, very porous and comprises siliceous fossils of plant algae. It consists primarily of amorphous silica as distinct from crystalline silica or quartz. Amorphous silica is much more soluble than crystalline silica and is not a health hazard.





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