Botanicare Clearex - Salt Leaching Solution, 5 GallonUse Clearex to correct the most common cause of crop failure the buildup of nutrient salt deposits in soils or soilless grow media. A common cause of crop failure can be traced to the build up of nutrient salt deposits in soils or soilless grow media. High salt concentrations in the soil solution cause a shrinkage of plant cell protoplasm away from the cell wall as a result of osmosis. This condition, known as plasmolysis, can eventually lead to