The present invention relates to canine COX-1 and COX-2 proteins; to canine COX-1 and COX-2 nucleic acid molecules, including those that encode such COX-1 and COX-2 proteins, respectively; to antibodies raised against such proteins; and to compounds that inhibit the activity of such proteins. A modulation control unit is provided to modulate a waveform of the current flowing on the LED by controlling the adjustment operation of the current adjusting unit. The catch is designed for removing the skimmer plate through insertion into the skimmer plate hole located at its center while the opposite end is an ergonomically designed handle for ease of retrieving the skimmer plate and the skimmer basket.