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These waters are frequently impregnated with alkali or salt, and on evaporating leave upon the bed of the lake a thin encrustation of snowy whiteness.
During the wet season the valleys often contain ephemeral lakes, whose waters on evaporating leave a playa, or mud flat, often covered with an alkaline encrustation of snowy whiteness.
Bibby J. M., Hukins D.W. (1993) ' Acidification is not a feasible method for preventing encrustation of indwelling urinary catheters ' .
Because of the risk of introducing infection, they should not be used to reduce catheter encrustation - rather the catheter should be replaced.
Conventional prevention and treatment of this problem involves acidification of the urine in order to prevent or dissolve the encrustation.