Sino Instruments Co., Ltd. 1 article published in JoVE Environment An Ultra-clean Multilayer Apparatus for Collecting Size Fractionated Marine Plankton and Suspended Particles Liang-Saw Wen1, Chih-Ping Lee1, Wen-Huei Lee1, Alan Chuang2 1Institute of Oceanography, National Taiwan University, 2Sino Instruments Co., Ltd. Plankton and suspended particles play a major role in the biogeochemical cycles in the ocean. Here, we provide an ultra-clean, low stress method for the collection of various sizes of particles and plankton at sea with the capability of handling large volumes of seawater.