Great info on chlorine/chloromine removal from tap water

[grimes390]

Sup yall, I thought this was very interesting.
Enjoy

pce

QUESTIONS REGARDING CHLORINE AND CHLORAMINE REMOVAL FROM WATER

Updated November, 2007

Q: Is it necessary to remove disinfectants from drinking water in a home setting?
A: No, chlorinated and chloraminated water is deemed safe for people and animals to
drink, and for all other general uses including bathing. The removal of either chlorine or
chloramine from drinking water is not necessary for public health but some customers
may elect to do so for common household purposes based on personal preference.

Chloramine is not a persistent disinfectant and decomposes easily from a chemistry point of
view (Valentine et al, 1998) but for water supply purposes chloramine is stable and it takes days
to dissipate in the absence of substances exerting chloramine demand (Wilczak et al., 2003b).
Therefore, it is not practical to remove chloramine by letting an open container of water stand
because it may take days for chloramine to dissipate.
However, chloramine is very easily and almost instantaneously removed by preparing a cup of
tea or coffee, preparing food (e.g., making a soup with a chicken stock). Adding fruit to a water
pitcher (e.g., slicing peeled orange into a 1-gal water pitcher) will neutralize chloramine within 30
minutes. If desired, chloramine and ammonia can be completely removed from the water by
boiling; however, it will take 20 minutes of gentle boil to do that. Just a short boil of water to
prepare tea or coffee removed about 30% of chloramine. Conversely, chlorine was not as
consistently removed by boiling in SFPUC tests.
If desired, both chlorine and chloramine can be removed for drinking water purposes by an
activated carbon filter point of use device that can be installed on a kitchen faucet. If desired, both
chlorine and chloramine can be removed for bathing purposes by dissolving Vitamin C in the bath
water (1000 mg Vitamin C tablet will neutralize chloramine in an average bathtub). SFPUC does
not recommend that customers remove disinfectants from drinking water. Customers desiring to
do so should consult with their physician.

Q: Why is it important to remove both chlorine and chloramine from the tap water used for
hemodialysis treatment of kidney dialysis patients?
A: While tap water is safe for drinking, bathing and other household uses, it is not
acceptable for use in hemodialysis. People can safely drink chloraminated water because
their digestive process neutralizes chloramine before it enters the bloodstream. But, just
like with fish that take chloramine directly into their bloodstream through their gills, the
membranes used for hemodialysis do not remove chloramine. In fact, the hemodialysis
fluid must be free of even traces of compounds that are safe to drink.

Residual disinfectants, particulates, organics, ions and remaining microorganisms are removed
prior to hemodialysis units. The average person consumes approximately 2 liters of water per day
in different forms (juice, coffee, etc.), whereas a patient on hemodialysis uses anywhere from 90
to 190 liters of water (in the dialysate) per treatment. In the dialyzer the blood is separated from
the dialysate by a semi-permeable membrane, which is only selective with respect to molecular
size but is not contaminant specific. The recommended maximum concentrations for
hemodialysis water are 0.5 mg/L chlorine and 0.1 mg/L chloramine (Amato, 2005).
Carbon adsorption is used to remove either chlorine or chloramine because both of them destroy
red blood cells. Chlorine and chloramine are not removed by the reverse osmosis membrane and
can also damage the membrane. At least two carbon beds are required in series for a total of 10
minutes empty bed contact time at the maximum flowrate to remove either chlorine or chloramine,
followed by a 1 to 5-um filter to remove carbon fines before the reverse osmosis unit (Amato,
2005).

Q: Why are some industrial users advised to remove chloramine but people are not?

A: Chloramine is added to the water for public health protection. Distilled or deionized water is
required for many industrial processes and products. On the other hand, distilled or deionized
water would not be appropriate for distribution and consumption due to its corrosivity, taste, and
health impacts. Three special user groups, kidney dialysis patients, aquarium owners, and
businesses or industries that use water in their manufacturing processes may need to remove
chloramine from the water prior to use as they did with chlorine. Products to remove or
neutralize chloramine are readily available.
Biotechnology companies and breweries must take treatment precautions for both chlorine and
chloramine. Beer manufacturers must remove chlorine and chloramine because either will inhibit
the growth of yeast. Photo labs may need to remove chlorine or chloramine from the water
because it may interfere with the chemicals used to develop the film and may adversely impact
the colors in the final print. Chip manufacturers and pharmaceutical companies have very specific
water quality requirements for their manufacturing process.

Q: What methods are used by the industry to remove chloramine and ammonia?

A: In the water industry, the most widely practiced methods of dechlorination are the addition of
reducing agents, for example, sulfite compounds, hydrogen peroxide and ascorbic acid - Vitamin
C (Tikkanen et al., 2001). Granular activated carbon (GAC) filters are also used for dechlorination
(Kirmeyer et al., 2004). Breakpoint chlorination is used routinely by some utilities to remove
chloramine and/or ammonia in the source water or to avoid blending chlorinated and
chloraminated water. During breakpoint chlorination, excess chlorine in chloraminated water
consumes the available ammonia and the remaining disinfectant residual exists as chlorine.

Q: How much time will it take for chlorine and chloramine to dissipate when left standing?

A: While both chlorine and chloramine residuals decrease with time, chloramine decreases more
slowly than chlorine. Chlorine may take days to dissipate in a pitcher left on a counter and it will
take longer for chloramine. The decomposition rate will be faster when the water is exposed to air
and sunlight (Wilczak et al., 2003b). Chloramine, like chlorine, will eventually dissipate completely
over time but it is not practical to let the water sit for it to dissipate. Other methods may be used to
remove chloramine if desired for aesthetic reasons.

Q: Can chlorine and chloramine be removed by boiling?

A: Boiling the water for 20 minutes will remove chloramine and ammonia. SFPUC does not
recommend for customers to boil water for such long periods of time because it is not necessary
from a public health perspective and poses risk of scalding. However, such tests demonstrate
that chloramine is not a persistent chemical, which does not remain in the water after cooking.
Additionally, many foods and drinks rapidly neutralize chloramine without the necessity of boiling
(e.g., tea, coffee, chicken stock, orange juice, etc.).

Q: Can charcoal filters remove chloramine?

A: Charcoal or granular activated carbon (GAC) filter can reduce chloramine concentrations of 1
to 2 mg/L to less than 0.1 mg/L. The GAC filter may be followed by a reverse osmosis (RO) filter
to remove the carbon fines. RO should not be used alone as chloramine will pass through the
membrane and may damage the RO membrane elements (some RO units are resistant to
chlorine and chloramine). A GAC filter will remove chloramine, allowing RO to effectively remove
other constituents.

Q: Are GAC filters certified and if so by whom?

A: As a public agency, the SFPUC does not test, endorse or recommend specific water filtration
products. Contact the NSF International, a nonprofit organization that independently tests and
certifies drinking water filtration products. Website:

NSF International, phone: 877-867-3435.
The removal of chloramine is not necessary from a public health perspective; however, some
customers may chose to remove either chlorine or chloramine for drinking purposes. Several
units are certified and listed on the NSF International website http://www.nsf.org/Certified/DWTU/

(accessed November 7, 2007) for the removal of chloramine: smaller units certified at flows
below 1 gpm (service cycle from 300 to 1600 gal) are appropriate for drinking water applications
at a kitchen faucet, larger units certified at 5 gpm (service cycle from 15,000 to 84,000 gal) could
be used for other uses if desired. NSF International verifies claims of 85% chloramine removal of
3 mg/L. GAC filters, if desired, need to be installed on the kitchen sink cold water tap as filter
effectiveness decreases in warm or hot water. The removal of disinfectant from the water may
increase the potential of bacterial regrowth in plumbing.

Q: Can Vitamin C be used to remove chlorine and chloramine for bathing purposes?

A: Exposures via respiration do not occur from use of chloraminated drinking water. Based on
personal preference, some individuals may choose to reduce exposure to chlorine or chloramine.
Vitamin C (ascorbic acid) has recently been included in AWWA Standard (AWWA, 2005b) as one
of the methods for dechlorination of disinfected water mains. SFPUC and other utilities have used
Vitamin C for dechlorination prior to environmental discharges of chlorinated and chloraminated
water. Since ascorbic acid is weakly acidic, the pH of water may decrease slightly (Tikkanen et
al., 2001). Ascorbic acid has been used for a long time as one of the dechlorinating agents for
preservation of chlorinated or chloraminated water samples for laboratory analysis.
The removal of chloramine is not necessary from a public health perspective; however, some
customers may chose to remove either chlorine or chloramine for bathing purposes. There are no
NSF International certified point of use devices utilizing Vitamin C, however SFPUC determined
that 1000 mg of Vitamin C (tablets purchased in a grocery store, crushed and mixed in with the
bath water) remove chloramine completely in a medium size bathtub without significantly
depressing pH. Shower attachments containing Vitamin C can be purchased on the Internet, as
well as effervescent Vitamin C bath tablets. The 1000 mg effervescent Vitamin C tablets
dissolved readily without residue but may depress pH more than regular Vitamin C tablets
purchased in grocery stores. Some shower attachments with Vitamin C marketed on the Internet
are effective in removing chloramine; however, the claims posted on the Internet as to their
replacement frequency appear to overestimate the duration when the shower attachment is
effective. There are reports of the benefits of Vitamin C for skin care (Griffith, 1998) and various
cosmetics are available in stores that contain Vitamin C. SFPUC does not recommend for
customers to use Vitamin C for bathing purposes and anyone desiring to do that should consult
with their physician.

Q: What are other simple methods to remove chloramine for drinking water purposes?

A: The removal of chloramine is not necessary from a public health perspective; however, some
customers may choose to remove chloramine for aesthetic reasons. Placing a few slices of fruit
(e.g., orange, lime, lemon, mango, strawberries) or vegetable (cucumber) in a water pitcher will
effectively dechlorinate the water within a few hours. A peeled and sliced medium size orange
can be used for a 1-gal water pitcher and will completely dechlorinate the water in 30 minutes.
The fruit can then be removed from the water. The water pH will become closer to neutral or
acidic (if lime or lemon is used). The ammonia will not be removed but most of the fruits
contribute some or more ammonia than the drinking water.
Preparing a cup of tea (black, green, caffeinated, decaffeinated, herbal) also removes
chloramine, as does coffee prepared in a common coffee maker.

Q: What are the methods for removing chloramine from fish aquariums?

A: Just as with chlorine, chloramine can harm saltwater and freshwater fish, reptiles, shellfish,
and amphibians that live in water, because they take chloramine directly into their bloodstream
through their gills. People and animals that don’t live in water can safely drink chloraminated
water because their digestive process neutralizes chloramine before it enters the bloodstream.
Effective procedures are available to remove chloramine and ammonia. Commercial
establishments and hobbyists involved in fish rearing need to take precautions to prevent losses.
There are two methods that can be used to remove or neutralize chloramine before adding
water to a fish tank, pond, or aquarium: (1) GAC filtration system specifically designed to remove
chloramine, or (2) conditioner or additive that contains a dechloraminating chemical for both
ammonia and chlorine. Products are available at local pet and aquarium supply stores.
Residential and commercial fish owners are advised to verify which method is best for them with
their pet store or aquatic/aquarium retailer.
If too much dechlorinating agent is added to the aquarium or pond water, it may bind up the
oxygen in the water. In this case, the fish may suffocate. It is important to carefully follow the label

instructions.

[syn]

ever try groteks 35% super oxy h202 , stuff works great , not only for getting the above chemicals out of your water , but it complaments c02 very well . i tested the tap water and the little strip was light red (heavy chlorine count ) added 5 drops per gal . 20 min later everything was pure as snow .

[Jaspmf]

I always leave my water sit out for a day or two before watering my plants.
From what I know most of the chlorine evaps.

[Fresh Brewed]

Have been pondering this very subject...Thanks. In the spring my shiitake and lion's mane logs should be ready to produce, and was thinking about aquarium dechlorinator to accomplish this before dunking.

[Myc]

Originally Posted by Fresh Brewed

Have been pondering this very subject...Thanks. In the spring my shiitake and lion's mane logs should be ready to produce, and was thinking about aquarium dechlorinator to accomplish this before dunking.

I'm off topic but...
I use strait tapwater to dunk my shiitake blocks - they don't mind at all.
I think the chlorinated tapwater helps wipe out any lurking pathogens on the surface of the colony.

I have - and have used - the aquarium dechlorinator. It doesn't seem to hurt anything.

[Fresh Brewed]

Thanks Myc

[boots420]

Whoa... thats hard reading on the eyes. Maybe edit and break up the text? Just a suggestion.

Best way in my opinion to remove chlorine/chloromites is a reverse osmosis filter.

My plants and my body both love me for it.

[Mushrooms201]

As boots mentioned it was hard to read but very much worth it. Thanks for sharing.

[gorilla]

too bad flourine is so hard to remove

[boots420]

Originally Posted by gorilla

too bad flourine is so hard to remove

a reverse osmosis filter can. i believe they remove about 99%.