A benthic screen for controlling aquatic plant growth comprising a sheet of flexible material, a plurality of spaced-apart, elongated retaining members that are transversely positioned across the width of the sheet and attachment means for securing each retaining member to the sheet. The second block of data comprises a data portion followed by a fill portion, the fill portion having a length equal to a length of the first block of data. The inside of the single air chamber is coated with a tacky adhesive layer providing distal-to-proximal sequential inflation as air is progressively introduced into the chamber, thereby creating a distal-to-proximal pressure gradient on a patient’s limb. The second electrode layer is disposed on the active layer. Movement of the wash water through the water supply hose is carried out by a hydraulic pressure of an external water supply source in an entire region of the water supply hose.