3/8 Inch Tubing Pack - 50 Ft - Black (10/cs). Hydro-Logic Purification Systems specializes in a wide range of professional quality water purification products designed for use in many applications including gardening and hydroponics, residential, aquarium, or commercial. We have the most efficient water purifiers in the industry, saving you time as well as money. From a backyard gardener to a professional coffee roaster, our customers appreciate our cutting-edge technology, simple set-up, affordable pricing and of course, amazing results.