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The airtight Lemco Seal forces the submersible pump to draw from the aquifer below instead of lowering the water level inside the well during the pumping cycle. Bill theroized that during dry spells, when the water level lowered naturally, that it could cause the pump to suck air and cavitation to occur. The majority of Bill's installations were in fine sand and had well screens. Even when there seemed to be plenty of water, he thought fine sand restricted water flow and could cause excessive drawdown.
Because the seal is airtight, it puts a negative pressure or suction on the well when the pump is running. This means it can also increase well production. In the illustration, the submersible pump is submerged in water even though drawdown is causing the pumping water level to be below the pump inlet. To use an analogy, it's similar to sucking on a straw and raising the level of the liquid above the glass. The Lemco Seal makes it possible to raise the water level, inside the well, far above the water level outside the well casing, which makes it ideal for low water level and slow producing wells.