[pct-l] CDC recommendations for water treatment

Bill Burge bill at burge.com
Thu Oct 21 21:03:57 CDT 2010


You need to avoid altering content that you indicate as "transcribing".

The line from your post:

"5)   Ultraviolet light treatment of water is not effective   against 
Cryptosporidium at normally-used levels. i.e. Steri Pen type products."

is NOT the same as what is in the original page:

"Ultraviolet light treatment of water is not effective against Cryptosporidium at normally-used levels."


That is not transcribing.  It is "interpretation".

Steripen's site points to a number of independent tests that DO indicate effectiveness against cyryptosporidium.
http://www.steripen.com/micro-biological-testing


BillB


On Oct 21, 2010, at 6:34 PM, jcil000-pctchat at yahoo.com wrote:

> The following recommendations by the Centers for Disease Control (CDC) are 
> useful in 
> 
> the avoidance of infection by Cryptosporidium. 
> 
> To avoid Crypto infection, they advise the following:
> 
> 1)  That the use of water filters which  an “absolute one micron” filter, or a 
> filter   certified to remove Cryptosporidium under NSF International Standard   
> #53 or #58 for either “cyst removal” or “cyst reduction” be used. (see A Guide 
> to Water Filters for more   information.
> 
> 2) That Cryptosporidium is poorly inactivated by chlorine or iodine   
> disinfection.***
> ***The product sold by REI called "Potable Aqua / Chlorine Dioxide Water 
> Purification Tablets" claims effectiveness in four hours.
> The down side to this product is that it "causes irreversible eye damage" if the 
> user gets residue into his/her eyes.
> 
> 3) That boiling at a rolling boil for 1 minute (at altitudes greater than 6,562 
> feet   (>2,000 m), boil water for 3 minutes) 
> 
> is recommended.
> 
> 4)  Cryptosporidium is not killed by alcohol gels and hand sanitizers.
> 
> 5)   Ultraviolet light treatment of water is not effective   against 
> Cryptosporidium at normally-used levels. i.e. Steri Pen type products.
> 
> CDC web links below:
> 
> http://www.cdc.gov/crypto/gen_info/filters.html
> 
> http://www.cdc.gov/crypto/health_professionals/bwa/dialysis.html
> 
> If I made a mistake in transcribing this information for my hiking friends, 
> please post corrections but I think I've summed up their information.
> 
> Also, in closing, the weblink shows wording by manufacturers which might be 
> misleading while reading a product label. Be sure to read that
> CDC warning.
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