The natural way to reduce organic silt and improve water quality in lakes and rivers

What is Siltex?

Siltex is a highly porous form of calcium carbonate consisting of microscopic particles with an average size of less than 5 microns (5 thousandths of a millimetre). Being calcium carbonate Siltex is harmless to plants and animals.


Where can Siltex be used?

Siltex can be used in freshwater environments such as ponds, lakes, reservoirs, rivers, canals and fisheries where organic silt accumulation is a problem. It can also be used to raise the pH of water bodies suffering from acidification.

How does Siltex work?

Silt is organic matter plus sand and clay combined with water in the form of a spongy mass. Organic silt accumulates when micro-organisms that normally digest the organic matter are no longer present due to low oxygen levels and increased acidity. The microscopic Siltex particles are able to penetrate the silt layer and create the right environment for the micro-organisms to re-establish themselves and digest the organic matter thus reducing silt volume. Siltex works best when the silt has a high organic content combined with acidity.

How is Siltex applied?

Siltex is supplied in 25kg bags and can be applied by sprinkling the product over the water surface. Larger areas of water can easily be treated by applying Siltex from a boat. Siltex is applied at a rate of one tonne (1,000kg) per acre of water surface for the first dressing followed by a second dressing of 800kg per acre six months later. Most sites benefit from regular treatments to combat continual organic accumulation from trees and other vegetation.

Siltex should always be applied to the whole water area of a lake and not just the worst affected parts.

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