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Author Topic: Filtering chemicals in water?  (Read 4825 times)

Offline deepthinker

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Filtering chemicals in water?
« on: 09/02/2007 21:40:29 »
Hi

I'm trying to compare water filters from two different manufactures, one from the US the other from the UK, but I’m getting lost in the chemistry! Sorry if these are really stupid questions but I would be really grateful if someone could just explain the answers in layman’s terms.

One filter says it filters Benzene while the other says its filters Fluoranthene, Benzo Fluoranthene, Benzo[K] Fluoranthene, Benzo[a]pyrene, Indeno[123cd]pyrene and benzo[ghi]perylene. Is the filter that removes Benzene likely to remove these polynuclear aromatic hydrocarbons as well?

I have a similar issue with one filter listing pentachlorophenol while the other filter lists  phenol and 2,4,6 trichlorphenol. Is the filter removing pentachlorophenol likely to remove phenol and 2,4,6 trichlorphenol as well?

Many thanks


 

Offline lightarrow

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Filtering chemicals in water?
« Reply #1 on: 09/02/2007 23:59:32 »
Which is the method used for filtration? Which substance(s) uses?
 

Offline deepthinker

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Filtering chemicals in water?
« Reply #2 on: 10/02/2007 08:12:38 »
Hi

one says:
Quote
"Aquasana’s exclusive dual filter system uses a combination of carbon filtration, ion exchange and sub-micron filtration to produce truly healthy, great tasting water at the convenience of your kitchen tap."
The other says:
Quote
Stage 1     
A ceramic barrier filters 99.99% of all particles larger than one micron (not visible to the naked eye). This includes bacteria, parasites, metals, organic matter and other chemicals. As deposits accumulate on the filter's outer surface, they can be easily removed, allowing the cartridge to be re-used again and again. Silver impregnation provides a second barrier to bacteria.
Stage 2
Our premium grade Granular Activated Carbon block eliminates organic pollutants such as agricultural pesticides and herbicides.
Stage 3
A different type of Carbon filter removes chlorine and improves taste and smell.
Stage 4
Special flow baffles improve the efficiency of the filtration process.
Stage 5
This ion exchange resin takes out dissolved metals such as cadmium, lead copper and mercury.
Stage 6
A 20 micron pure polypropylene layer prevents the escape of any carbon or resin particles.

Many thanks.
 

Offline Bored chemist

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Filtering chemicals in water?
« Reply #3 on: 10/02/2007 16:22:08 »
Activated carbon which is included in both filters will take out all the compounds you have listed.
Since you are in the UK I'd be very suprised if the tap water wasn't perfectly fit to drink without filtration. There was an problem a while back with benzene in a well known brand of bottled water.
 

Offline lightarrow

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Filtering chemicals in water?
« Reply #4 on: 11/02/2007 20:48:20 »
FILTERED BY CARBON:

Chemicals

Acetaldehyde
Acetic Acid
Acetone
Alcohols
Amines
Amyl Acetate
Amyl Alcohol
Antifreeze
Benzene
Bleach
Butyl Alcohol
Butyl Acetate
Calcium Hypochlorite
Chloral
Chloamine
Chloroform
Chlorine
Chlorobenzene
Chlorophenol
Chlorophyll
Citric Acid
Cresol
Defoilants
Detergents
Diesel Fuel
Dyes
Ethyl Acetate
Ethyl Acrylate
Ethyl Alcohol
Ethyl Amine
Ethyl Chlorine
Ethyl Ether
Gasoline
Glycols
Herbicides
Hydrogen Peroxide
Hydrogen Selenide
Hydrogen Sulfide
Hypochlorous Acid
Insecticides
Iodine
Isopropyl Acetate
Isopropyl Alcohol
Ketones
Lactic Acid
Mercaptans
Methyl Acetate
Methyl Alcohol
Methyl Bromide
Methyl Chloride
Methyl Ethyl Ketone
Naphtha
Nitric Acid
Nitrobenzene
Nitrotoluene
Odors (general)
Oil Dissolved
Organic Acids
Organic Esters
Organic Salts
Oxalic Acids
PCB?s
Pesticides
Phenol
Plastic Taste
Propioic Acids
Propionaldehyde
Propyl Acetate
Propyl Acid
Propyl Chloride
Rubber Hose Taste
Soap
Sodium Hydrochorite
Solvents
Sulphonated Oils
Tannins
Tar Emulsion
Tartaric Acid
Taste (DI Water)
Taste (From Organics)
THM?s
Toluene
Toluidine
Trchlorethylene
Turpintine
Vinegar
Xanthophyll
Xylene

Organic Contaminants

2,4,5-TP
2,4-D
Acrylamide
Adipates (diethylhexyl)
Alachlor
Aldicarb
Aldicarb Sulfone
Aldicarb Sulfoxide
Atazine
Benz(a)anthracene (PAH)
Benzene
Benzo(a)pyrene (PAH)
Benzo(b)fluoranthene (PAH)
Benzo(k) fluoranthene (PAH)
Bromodichloromethane
Bromoform
Butyl benzyl phthalate (PAE)
Carbofuran
Carbon Tetrachloride Chlordane
Chloroform
Chrysene (PAH)
Dalapon
Dibenz(a,h) anthracene (PAH)
Dibromochloromethane
Dibromochloropropane (DBCP)
Dichlorobenzene (o-,m-)
Dichlorobenzene (para-)
Dichloroethane (1,2-)
Dichloroethylene (1,1-)
Dichloroethylene (cis-1,2-)
Dichloroethylene (trans-1,2-)
Dichloromethane (methylene chloride)
Dichloropropane (1,2-)
Diethylhexyl phthalate (PAE)
Dinoseb
Diquat
Endothall
Endrin
Epichlorohydrin
Ethylbenzene
Ethylene dibromide (EDB)
Glyphosate
Heptachlor
Heptachlor epoxide
Hexachlorobeneze
Hexachlorocyclopentadiene
Indeno (1,2,3-c,d) pyrene (PAH)
Lindane
Methoxychlor
Monochlorobenzene
Oxamyl (vydate)
Pentachlorophenol
Picloram
Polychlorinated byphenyls (PCBS)
Simazine
Styrene
Tetrachloroethylene
Toluene
Toxaphene
Trichlorobenzne (1,2,4)
Trichloroethane (1,1,1-)
Trichloroethylene
Trichloroethylene (1,1,2-)
Trihalomethanes (THMs)
Vinyl Chloride
Xylene (total)
2,3,7,8-TCDD (Dioxi
 
 

Offline Brian K

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Filtering chemicals in water?
« Reply #5 on: 23/09/2007 18:08:09 »
My water company (Calafornia USA) recently switched from using Chlorine to Chloramine as a disinfectant. I noticed in the list of chemicals that carbon fliters out that someone posted below has "Chloamine," but not "Chloramine." Was that a typo?  I would really like information on how to protect myself from Chloramine. Would a reverse osmosis system take out Chloramine?

Thanks!
 

Offline rosy

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Filtering chemicals in water?
« Reply #6 on: 23/09/2007 20:42:14 »
Urrm, I don't know whether that's a typo or not but googling for chloramine and "water filter" gives a number of products made using activated charcoal to remove chloramine from drinking water. So clearly activated charcoal will take out chloramine.
Googling chloamine gives a number of results most of which do look like they're probably typos for chloramine, I can't see anything that suggests chloamine is actually a real additive...
 

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Filtering chemicals in water?
« Reply #6 on: 23/09/2007 20:42:14 »

 

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