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A water filter removes impurities by lowering contamination of water using a fine physical barrier, a chemical process, or a biological process. Filters cleanse water to different extents, for purposes such as: providing agricultural irrigation, accessible drinking water, public and private aquariums, and the safe use of ponds and swimming pools .
An instant hot water dispenser or boiling water tap is an appliance that dispenses water at about 94 °C (201 °F) (near- boiling ). There are hot-only and hot and cool water models, and the water may be filtered as well as heated. Instant hot water dispensers became popular in the 1970s. Instant hot water dispensers are very similar to ...
The history of water filters can be traced to the earliest civilisations with written records. Water filters have been used throughout history to improve the safety and aesthetics of water intended to be used for drinking or bathing. In modern times, they are also widely used in industry and commerce. The history of water filtration is closely ...
Point of use water filters are used in individual houses or offices to provide filtration of potable water close to the point of consumption. [1] The related topic, Point of use water treatment describes full-scale water treatment options and technologies designed to serve communities when municipal water treatment fails or is unavailable.
Emmett J. Culligan. Culligan was founded in 1936 by Emmett Culligan. With $50 and with additional financing by his brother Dr. John M. Culligan, and his sister, Anna V. Culligan, Emmett established the Culligan Zeolite Company with his brothers Drs. John and Leo Culligan as partners.
Sinc-in-time. Sinc-in-time is an ideal filter that removes all frequency components above a given cutoff frequency, without attenuating lower frequencies, and has linear phase response. It may thus be considered a brick-wall filter or rectangular filter. Its impulse response is a sinc function in the time domain :
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