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Which is the difference between HAE (high-air entry) and LAE (low-air entry) filters?

April 26, 2017difference filters hae lae

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Which is the difference between HAE (high-air entry) and LAE (low-air entry) filters?

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HAE filters are normally used to monitor pore pressure in the clay core dams and saturated low permeability soils. “High air entry” means high-resistance to air entry when the filter is saturated. The surface tension of the water in the very fine pores of the filter prevents entry of air. The HAE filters must be saturated before installation by means of the saturation device.