If you could use a little more free counter space, this is the perfect unit for your kitchen! With the quality and power of the SD501, but the convenience of nestling discreetly under your sink, this Enagic® machine is both practical and highly accommodating. You will still enjoy a fully featured, compact LCD control panel that is wall-mounted. Like all 501 models, the SD501 uses innovative electrolysis technology with 7 platinum-coated 99.97% pure titanium electrode plates.