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Topic: Filter (chemistry)

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	filter - Search Results - MSN Encarta
		Filters added to the front of a camera lens change the quantity or quality of the light that reaches the film.
		The term filter may refer to: * In chemistry, engineering, or household usage, a device to separate mixtures.
		Filter is an industrial rock group formed in 1993 by Richard Patrick (former live guitarist for Nine Inch Nails) and guitarist/programmer Brian Liesegang.
	www.encarta.msn.com /encnet/refpages/SRPage.aspx?search=filter (238 words)

	Filter - Wikipedia, the free encyclopedia
		In chemistry, engineering, or household usage, a device to separate mixtures.
		Filter (band), an industrial rock band of the 1990s
		Filter feeder, an animal that strains food particles from water
	en.wikipedia.org /wiki/Filter (179 words)

	Filter (chemistry) - Wikipedia, the free encyclopedia
		In chemistry and common usage, a filter is a device (usually a membrane or layer) that is designed to block certain objects or substances while letting others through.
		Filters are often used to remove harmful substances from air or water, for example to remove air pollution, to make water drinkable, to prepare coffee.
		Filtrate is the liquid produced after filtering a suspension of a solid in a liquid.
	en.wikipedia.org /wiki/Filter_(chemistry) (123 words)

	Howstuffworks "How Swimming Pools Work"
		During filtering operation, dirty water from the pool comes in through the filter's inlet pipe, which leads to the water distribution head inside the tank.
		He or she adjusts a valve at the filter to connect the pipe from the pump to the outlet pipe and connect the drainage pipe to the inlet pipe.
		In a diatomaceous earth filter, water from the pool passes through filter grids coated with diatomaceous earth, a fine powder made from the chemically inert, fossilized remains of sea organisms called diatoms.
	home.howstuffworks.com /swimming-pool6.htm (521 words)

	MARINELAND.COM - DR. TIM'S LIBRARY (Site not responding. Last check: 2007-10-10)
		It is common sense to use a larger filter on a larger tank and trying to save a few dollars by getting a filter that claims to be for all sizes of aquariums will cost you more in the long run.
		A widespread misconception is that the air bubbles in the lift tube of an undergravel filter significantly contribute to the aeration of an aquarium.
		Undergravel filters can be good biological filters but they also are good mechanical filters which is their downfall.
	www.marineland.com /articles/29Myths.asp (6856 words)

	ChemTracts
		The timely updates in the various sub-disciplines of chemistry are ideal for research directors, students, industrial scientists, and others interested in chemistry.
		In 1988, an important new publication was launched in the field of chemistry.
		With ChemTracts, recognized authorities filter the voluminous scientific literature and select the most outstanding research papers in their field, and these Expert Analysts give summaries of the selected research, expert commentary as to why the work was selected, and cite references to the most important related papers.
	www.datatrace.com /chemistry (414 words)

	Filtration - QuickSeek Encyclopedia (Site not responding. Last check: 2007-10-10)
		In chemistry and alchemy, filtration is the process of using a filter to mechanically separate a mixture.
		In addition the substance that is to pass through the filter must be a fluid, i.e.
		These will use a filter that has properties so that undesirable items are attracted and retained by the filter, and the fluid from which it is to be separated is not.
	filtration.quickseek.com (429 words)

	Chemistry (Site not responding. Last check: 2007-10-10)
		But when the filter begins building up pressure from continual vacuuming, the flow rate through the filter goes down and the water in the pool is not moving through the system fast enough.
		As you backwash from filter to rinse several times, you are actually reversing the water flow inside the filter by banging water up against the screens with force to release the trapped debris.
		If you forget to recoat the filter screens with DE the dirt will collect directly on the screens and you may clog the screens and have to disassemble the filter and clean them with a hose.
	www.bluewaterpools.com /chemistry.htm (5222 words)

	HEPA - Biocrawler (Site not responding. Last check: 2007-10-10)
		The original HEPA filter was designed in the 1940s for and used in the Manhattan Project to prevent the spread of airborne radioactive contaminants.
		It was commercialized in the 1950s and the original term became a registered trademark and a generic term for highly efficient filters.
		Over the decades, filters have evolved to satisfy the higher and higher demands for air quality in various high technology industries, such as aerospace, pharmaceutical processing and electronic microcircuitry (computer chips).
	www.biocrawler.com /encyclopedia/HEPA (270 words)

	Filter (Site not responding. Last check: 2007-10-10)
		FILTER: The filtration equipment of your pool-the FILTER (filtration) and the PUMP (circulation) constitute what is known as your (mandatory) pool equipment; a heater and an automatic chemical feeder are optional equipment.
		The reason is that if water is in the filter and this water does start to freeze, the drain plug/cap is designed to pop out as the near freezing water begins to expand, relieving pressure from the filter tank.
		After this 4-5 years, once filter cycles decrease (when it is taking less time for the pressure guage to show a rise of 8-10 psi) and the need for backwashing increases, contract your local pool professionals and pay them to change the sand.
	www.poolmanual.com /manual/filter.html (2422 words)

	Chemistry: electrical and wave energy inventions new
		Chemistry: electrical and wave energy patents - Monitor Patents
		20070187229 - Filtered cathodic-arc plasma source: A filtered cathodic-arc plasma source of lower plasma losses and higher output plasma current to input current efficiency is disclosed.
		Plasma filtering is accomplished in a right angle bend magnetic filter arranged to include the effects of at least three added magnetic coils located at the right angle bend of...
	www.freshpatents.com /Chemistry--electrical-and-wave-energy-dtnewntc204.php (2724 words)

	The Night I Bought a Water Filter
		He proceeded to subject the filtered water to the same kind of electrocution as had been experienced by my "toxin-laden" tap water, but this time the results were dramatically different.
		In addition to teaching chemistry at McGill, he hosts a weekly "phone-in" show about chemistry on Montreal radio station CJAD, writes a weekly column called "The Right Chemistry" in the Montreal Gazette, and has a regular TV feature entitled "Joe's Chemistry Set" on the Canadian Discovery Channel.
		This article was adapted from the preface to his book The Genie in the Bottle, a collection of commentaries on the fascinating chemistry of everyday life.
	www.quackwatch.org /01QuackeryRelatedTopics/filter.html (1876 words)

	The Ductile Iron News
		These filters equate to recommended capacities of approximately 2150 to 3000 pounds and 2750 to 3850 pounds for steel and twice that for iron, respectively.
		These filters have been found to provide exceptional benefit to extremely drossy metal pours that have a tendency to blind off the surface of the filter, and can be produced in any filter chemistry desired.
		In either case a blank, a removable object to mimic the filter size, is used to insert the filters.
	www.ductile.org /magazine/2005_1/reticulatedfiltration.htm (1759 words)

	MICRO: Tool/Fab Support
		While Teflon filters were unaffected by the strong solvents used in photochemicals and their membrane structures had comparatively low organic and ionic extractables, the Teflon surface was much less wettable than the nylon and cellulosic filters they replaced.
		Filter manufacturers must perform a balancing act by developing membrane surfaces that both remove bubbles from photochemical fluid and retard bubble formation downstream of the filter.
		While filter modification 1 (a nonsieving UPE filter with a surface similar to nylon) adsorbed some contaminant material from the photoresist in the nylon-adsorption area, the base UPE membrane did not adsorb material.
	www.micromagazine.com /archive/05/05/amari.html (3194 words)

	Institute of Ecosystem Studies
		The cellulose filters were cleaned before coating by rinsing and soaking overnight in double-deionized water (from 1988-1997 cleaning consisted of heating filters in concentrated KOH to 70-80 deg C for 30 min.
		The Teflon filters were extracted in 50 ml of double deionized water for 24 hours in the dark at 2 degrees C after sonication for 15 minutes.
		All filter packs and bottles were cleaned by rinsing in deionized water 7 times, allowing to soak overnight in deionized water, rinsing again 4 times in deionized water and finally either dried in a drying oven at no more than 60 degrees C or allowed to sit with caps loosened (bottles) until bottle was dry.
	www.ecostudies.org /emp_air.html (938 words)

	Automated Purification of Combinatorial Libraries Using AcroPrep™ 96 Filter Plate with GHP Membrane
		Filtration media used for combinatorial chemistry synthesis or cleavage applications is designed to retain the solid-phase beads while allowing the solution phase to pass during the wash steps.
		A high grade of polypropylene was selected for the housing of AcroPrep 96 filter plate to ensure that the material would offer a high level of chemical compatibility for a wide range of solutions while maintaining integrity of analytical results.
		Filter plates were carefully removed and receiver plates read in a PerkinElmer Life Sciences Wallac VICTOR 1420 Multilabel Counter.
	www.pall.com /34696_26510.asp (2398 words)

	Chemistry: electrical current producing apparatus, product, and process inventions new
		20070196728 - Cooling system for vehicle battery pack containing double filter device: Disclosed herein is a cooling system for vehicle battery packs, including a double filter device mounted at an air inlet part, through which air for cooling the battery pack is introduced from the outside and/or the inside of the vehicle.
		There are a variety ways to browse Chemistry: electrical current producing apparatus, product, and process patent applications on our website including browsing by date, agent, inventor, and industry.
		If you are interested in receiving occasional emails regarding Chemistry: electrical current producing apparatus, product, and process patents we recommend signing up for free keyword monitoring by email.
	www.freshpatents.com /Chemistry--electrical-current-producing-apparatus-product-and-process-dtnewntc429.php (7639 words)

	Hayward Pools / Troubleshooting / Filters (Site not responding. Last check: 2007-10-10)
		The filter elements may be clogged because of an accumulation of chemical deposits.
		DE must be added as soon as the filter is full of water, and the pump is putting out a steady stream of water.
		Your filter operation time may not be long enough to compensate for heavy use or hot weather.
	www.haywardnet.com /owners/troubleshooting/filters.html (1594 words)

	A New Rapid and Effective Chemistry Space Filter in Recognizing a Druglike Database
		To develop a new chemistry space filter with high efficiency and accuracy, an analysis on distributions of as many as 50 structural and physicochemical properties was carried out on both druglike and nondruglike databases, viz.
		The filter is composed of two descriptors: one is a molecular saturation related descriptor, and the other is associated with the proportion of heteroatoms in a molecule.
		Therefore, this newly developed chemistry space filter should be a potent tool for identifying druglike molecules, thus, it would have potential applications in the research of combinatorial library design and virtual high throughput screening using computational approaches for drug discovery.
	pubs.acs.org /cgi-bin/abstract.cgi/jcisd8/2005/45/i04/abs/ci050031j.html (277 words)

	Filter Paper for Chemistry-Biology; Qualitative, Medium Speed, 7-18cm
		he filter papers listed below are all medium speed, qualitative type and come 100 sheets per box.
		Filter paper can be used for extraction or as a support medium.
		You can visit this archive of experiments at Queens University in Kingston, Ontario that describes how to use filter paper to do paper chromatography.
	www.indigo.com /science-supplies/filter-paper.html (138 words)

	Pool Water Chemistry
		Proper water chemistry is essential to maintaining safe and consistent swimming pool operation.
		Following is a discussion of various factors which affect water chemistry, how they affect swimming pools and how to use pool chemicals to restore a properly balanced water chemistry.
		It is then necessary to provide for disinfection of the water to prevent the spread of disease organisms from person to person and prevent unwanted growth of bacteria and algae in the pool.
	www.deh.enr.state.nc.us /ehs/chem.htm (3096 words)

	HOW AND WHEN TO CARE FOR YOUR CARTRIDGE FILTER
		It is important to size filter according to pump and gallonage.Improper sizing can result in equipment failure or inadequate filtration.
		Assuming the Filter is properly maintained and correctly sized to the pump, determining when the Cartridge is exhausted depends primarily upon three factors: 1) Shorter cycle time between cleanings, 2) Low water flow rate and high differential pressure, and 3) Catastrophic failure such as a tear in the media or center core collapse.
		Filter elements are plastic and should be handled and maintained accordingly.
	pool-spacare.com /e-pool-cartridgecare.html (796 words)

	The Diamond Filter
		The Filter was designed for the avid water drinker.
		It was developed by a father and son both with PhD's in Chemistry.
		The filter is designed to remove toxic metals, synthetic chemicals, lead and chlorination by-products that contaminate our tap water.
	www.diamondfilter.com (147 words)

	The Science House - Countertop Chemistry
		Obtain a piece of filter paper (or a coffee filter) and use a pencil to trace a circle approximately 4 cm.
		Use a pencil to number the areas on the filter paper for each of the substances to be tested.
		Use the pencil to punch a hole in the center of the filter paper or coffee filter.
	www.science-house.org /learn/CountertopChem/exp4.html (753 words)

	Sterlitech :: Superior laboratory filtration products
		Sterlitech Corporation specializes in inorganic filter membranes and bench scale testing equipment for a variety of industries, including the occupational health and safety, petrochemical, fossil fuels and biotech industries.
		Syringe Filters are disposable filtration which are available in Nylon, Teflon, and Cellulose Acetate media.
		Vacuum filtration is used primarily in microbiological and analytical procedures that involve collecting a particulate (bacteria, precipitate, etc.) from a liquid suspension.
	www.sterlitech.com (237 words)

	Journal of Aquariculture & Aquatic Sciences Article
		The water chemistry in Devil's Hole is reported by Dudley and Larson (1974) as shown in Table 1.
		The aquarium was filter with a Tetra Brilliant Sponge filter mounted on the center rear glass.
		Water chemistry analysis was performed by the Hach drop count method indicating values as follows: pH 8.5; Cl 181.1 mg/l; Ca 206 mg/l; Mg 154.61 mg/l; total hardness (CaCO3); 360.75 mg/l; total alkalinity 171.79 mg/l; dissolved oxygen 7.0 mg/l.
	www.petsforum.com /cis-fishnet/JAAS/D046.htm (1179 words)

	HEPA - (Site not responding. Last check: 2007-10-10)
		A HEPA filter (theoretically) can remove from the air at least 99.97% of dust, pollen, mold, bacteria and any airborne particles with a size of 0.3 micrometres.
		The common assumption that a HEPA filter acts like a sieve where particles smaller than the hole size get through is entirely incorrect (membrane filters do work that way).
		In a HEPA filter, particles are trapped (they stick to a fiber) by one of three mechanisms; diffusion, interception or impaction.
	psychcentral.com /psypsych/HEPA (374 words)

	Underwater Pool Masters, Inc. - Summer Services
		We can simply monitor the water chemistry and filter or perform full maintenances with vacuuming while you are gone, so that you can return to a clean and swimmable pool.
		Filter Cleaning & Sand Changes - If you have noticed that your system is not circulating like it once did or your water just won't clear, it may be time to clean your filter.
		The sand in a sand filter should be changed about every six years and a D.E. filter should be dismantled and cleaned at least every other year.
	www.underwaterpools.com /summer.html (1046 words)

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