Filter cake is a commonly used term in the filtration industry. It refers to the accumulation of solid particles left behind after a filtration process. However, there are several other synonyms for filter cake that can be used depending on the context and type of filtration. Some of these include residue, sludge, sediment, precipitate, and dregs. Each of these terms describes the same concept of particles left behind after filtration but may be more appropriate in certain situations. For example, residue may be used more in the context of chemical reactions, while sludge may be used more in wastewater treatment plants. Regardless of the term used, understanding filtration terminology is essential for effective process design and troubleshooting.