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The air that is delivered by this type of Hookah compressor is pure, oil free air. It is however recommended that at least a 40 micron filter be included to remove any solid particles that may occur. This type of Hookah compressors contains sealed bearings rather than oil for lubrication which can contaminate the air supply. Most compressors utilize an “oil bath lubrication system which will contaminate the air supply.

Hookah compressors operate at a relatively low pressure. The maximum pressure available from the higher capacity models is about 125 pounds per square inch. The higher the operating pressure, the lower the air output. Consistently high operating pressures (unless the unit specifically designed for high pressure use) will shorten the life of the compressor by a noticeable degree. Conversely, the LOWER the operating pressure, the greater the air output, and the longer the compressor life. A compressor should not be operated at high pressures unless a diver intends to be submerged at greater depths. If a diver is working at depths of 33 feet or less, he will need only 30 to 40 pounds per square inch for optimum operation of his regulator.

Most Hookah compressors have a built in "pressure relief valve" which prevents excessive pressure from building up in the compressor head when the diver is only making a small "demand" on the compressor. This valve is usually preset at the factory at approximately 50 p.s.i., which will give the average diver at shallow depths enough air to operate his regulator while leaving enough pressure left over to allow for increased exertion.

If a diver is breathing at a normal rate (light exertion), the pressure relief valve will occasionally "pop off" and shoot out a burst of air. This is normal, as it prevents excess buildup of pressure in the compressor head. If a diver is breathing heavily and is under physical exertion, he will be demanding all of the volume and pressure that the compressor can deliver. In this case, the pressure relief valve will rarely, if ever discharge excess pressure or "pop off."

The type of Hookah compressor that is required for a given diving operation is dependent upon the extent of underwater physical exertion, the depth, and the number of divers that are connected to the system. A single diver under light exertion at shallow depths will require a relatively small air output that is measured in "cubic feet per minute," or "CFM". The same diver under heavy exertion will require additional air at a slightly higher pressure and volume.

If more than one diver is connected to an air system, or if diving at greater than normal depths, more air volume at higher pressures may be required.