An apparatus and method generating an optical pulse of picosecond class, which accurately and stably operates at an arbitrary repetition frequency, has a high OSNR, and is not restricted by an RF modulation frequency, are provided. A bioflocculent, comprising a composition comprising a bacteria, is used to aggregate the algae. At least one high-pressure pressurizer is connected to the supply line and configured to pressurize the cleaning liquid which is stored in a pressurized tank. The parameter is then extracted from the intra-switch header, and used to control processing of the data traffic in the egress interface. The method comprises producing a multi-ply product having different emboss patterns on each ply where the emboss patterns are made up of emboss elements having an aspect ratio of from about 1 to about 2. The first lens to the third lens are all single lenses and, when the average refractive index of the first lens to the third lens is taken as NdH, the eyepiece optical system satisfies a conditional expression : 1.