The WS3 is a higher pressure version of the M2K3 with all its advantages.

Life in the aquarium depends on the air pump. It must work around-the-clock. Schego is the pump you can depend on over all others. In addition, extremely high pressures and extended life makes Schego the perfect pump for protein skimmers as well as wooden and ceramic air stones; it is recommended even for deep aquariums. We have been utilizing an M2K3 on a 4ft deep aquarium pumping air through a bubble wand under a piece of coral that absolutely churns the surface of the water. The pump is placed 4 feet below the aquarium on the floor. The airstone has not been replaced since 1986 and, with the exception of replacing the air filters, no diaphragm or part has needed repair. This is a testimonial that speaks for itself. No pump comes close to the silent operation, pressure, and reliable operation this pump puts out for anywhere near the price.

The clear case allows easy viewing of pump operation and the filter element is easy to change, extending the life of the diaphragm. Air filters on air pumps cannot be by-passed because the base has an efficient seal not found on most pumps. Schego pumps are O-ring sealed like no other pump to prevent this problem. Compare these to Supra prices and see the difference European hobbyists have benefited from for years.

350lph or 92.4gph at 3m/ 118"
WS3 offers a higher pressure ideal for decorative columns or protein skimmers.