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N,N-Diethyl-meta-toluamide, also called diethyltoluamide or DEET ( / diːt /, from DET, the initials of di- + ethyl + toluamide), [ 1][ 2] is the oldest, one of the most effective and most common active ingredient in commercial insect repellents.
Schematic diagram of a Berkefeld filter Berkefeld field filter. A Berkefeld filter [1] is a water filter made of diatomaceous earth ().It was invented in Germany in 1891, and by 1922 was being marketed in the United Kingdom by the Berkefeld Filter Co. [2] Berkefeld was the name of the owner of the mine in Hanover, Germany, where the ceramic material was obtained.
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 .
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 ...
Instead of using the static pressure of a water supply line to force the water through the filter, pressure is provided by a hand-operated pump. These devices can generate drinkable water from seawater. The Portable Aqua Unit for Lifesaving (short PAUL) is a portable ultrafiltration-based membrane water filter for humanitarian aid. It allows ...
Infobox references. Ethyl butylacetylaminopropionate is an insect repellent whose trade name is IR3535 and was developed and commercialized by Merck KGaA (Germany). It is a colorless and odorless oil with a good skin feel in final products, and it is biodegradable. [ 1][ 2][ 3]
A Victorian ceramic water filter. Ceramic water filters ( CWF) are an inexpensive and effective type of water filter that rely on the small pore size of ceramic material to filter dirt, debris, and bacteria out of water. This makes them ideal for use in developing countries, [ 1] and portable ceramic filters are commonly used in backpacking.
Activated carbon. Activated carbon, also called activated charcoal, is a form of carbon commonly used to filter contaminants from water and air, among many other uses. It is processed (activated) to have small, low-volume pores that greatly increase the surface area [1] [2] available for adsorption or chemical reactions [3] that can be thought of as a microscopic "sponge" structure (adsorption ...
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