Filter (chemistry) in the context of "Colander"

A winemaker or vintner is a person engaged in winemaking. They are generally employed by wineries or wine companies, where their work includes:

• Cooperating with viticulturists
• Monitoring the maturity of grapes to ensure their quality and to determine the correct time for harvest
• Crushing and pressing grapes
• Monitoring the settling of juice and the fermentation of grape material
• Filtering the wine to remove remaining solids
• Testing the quality of wine by tasting
• Placing filtered wine in casks or tanks for storage and maturation
• Preparing plans for bottling wine once it has matured
• Making sure that quality is maintained when the wine is bottled

Today, these duties require an increasing amount of scientific knowledge, since laboratory tests are gradually supplementing or replacing traditional methods. Winemakers can also be referred to as oenologists as they study oenology – the science of wine.

In marine and freshwater ecology, a particle is a small object. Particles can remain in suspension in the ocean or freshwater. However, they eventually settle (rate determined by Stokes' law) and accumulate as sediment. Some can enter the atmosphere through wave action where they can act as cloud condensation nuclei (CCN). Many organisms filter particles out of the water with unique filtration mechanisms (filter feeders). Particles are often associated with high loads of toxins which attach to the surface. As these toxins are passed up the food chain they accumulate in fatty tissue and become increasingly concentrated in predators (see bioaccumulation). Very little is known about the dynamics of particles, especially when they are re-suspended by dredging. They can remain floating in the water and drift over long distances. The decomposition of some particles by bacteria consumes much oxygen and can cause the water to become hypoxic.

A filter cake is formed by the substances that are retained on a filter. Filter aids, such as diatomaceous earth or activated carbon are usually used to form the filter cake. The purpose is to increase flow rate or achieve a smaller micron filtration. The filter cake grows in the course of filtration, becoming "thicker" as particulate matter and filter aid is retained on the filter.

With increasing layer thickness, the flow resistance of the filter cake increases. After a time, the filter cake has to be removed from the filter, e.g. by backflushing. If this is not accomplished, the filtration is disrupted because the resistance of the filter cake gets too high; hence, too little of the mixture to be filtered can pass through the filter cake, and the filter becomes plugged or clogged. The specifications of the filter cake dictate the filtration method of choice.