Tank is sealed so there is no reason to drain it. The water spinning in the sealed tank forms a unique, ring-shaped fluid mass which carries your momentum forward from stroke to stroke. Resistance you feel is flow of water along the inner tank surface. Has a natural, relaxing sound akin to a breaking wave. Water flywheel system is made from finest materials.
Sprag clutch engages seemlessly with zero slip.
Stainless steel blade in Lexan tank turns with slightest pull. Silent running Dacron strap gives vibration free power. Natural self-damping property of water minimizes shock loads. Warranty is 3 years.