Coarse bubble diffusers are a type of aeration device used in water treatment processes, particularly in wastewater treatment plants. They're designed to introduce large bubbles into water or liquid, aiding in the transfer of oxygen and mixing within the water body. These diffusers typically consist of larger apertures or openings through which air is released into the water. The bubbles produced are comparatively larger in size compared to fine bubble diffusers, which allows for more rapid ascent through the water column. This ascent facilitates mixing and helps in the aeration process by bringing oxygen from the air into contact with the water.

A filter press is a solid-liquid separation device used to dewater sludge, separate solids from liquids, and filter materials in various industries, including wastewater treatment, chemical, pharmaceutical, and food processing. The primary purpose of a filter press is to efficiently remove liquid from a mixture and produce a dry cake material. The device comprises a series of filter plates with recessed chambers and a filter cloth or other filter media between each plate. The plates are typically made from materials such as polypropylene, stainless steel, or cast iron. The filter plates are assembled together, forming a stack with an opening in the centre for the feed to enter the chambers.