Diatomaceous earth or kieselgur are fossil earths from marine algae, composed largely of silica.
There are three categories of diatoms:
- Natural earths
- Burnt earth
- Sintered earths
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Calcined and sintered diatomaceous earth is used according to its permeability and its category in the filtration and clarification of liquids such as:
- Industrial water
- Wines
- Vegetable oils
- Sugar syrup
- Waxes
- Glues
- Sulphur
- Any industrial liquid
These soils in their natural, non-calcined form are also used as a natural mechanical insecticide.
Perlite is a vitreous rock of volcanic origin composed mainly of silica and is also a filtration earth.
Physically, thermally treated and expanded, it is used according to its permeability for the filtration of all liquids, musts, aromas, oil dewaxing, wastewater treatment and in hydroponics (agriculture).