E-Mail 'Obsoleting Sodium Hypochlorite - The MSR SE200, by Hugh Latimer' To A Friend

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7 Comments

  2. Just curious if anyone has had any luck with making their own version of these with all of the DIY instructions and YouTube videos on these generators. While MSR makes great products, it seems the scientific principle has been in use for years in developing countries.

  3. Very good read. MSR’s experience in real disasters exposes weaknesses in equipment and in relying on simple solutions to the water problem. Hats off to MSR for their courage and willingness to fail and learn. Not many have such honesty!
    I store a LOT of calcium hypochlorite to run my Lakewater System, which processes stream water for our cabin full time. I haven’t seen the corrosion problem yet, but I know it is a real concern. My interested in this kit stems from the fact that someday the stockpile can run out or age beyond effective performance.
    UV light does kill Giardia and cryptosporidium, however, sunlight intensities to not work on these two pests.
    I offer this web page to shed more light on the UV issue and water purification. http://www.watertreatmentguide.com/ultraviolet_systems.htm
    In this article it gets into how MUCH UV is needed to kill various pathogens, and some are much tougher than others.
    Not long ago, Milwaukee experienced a Crypto outbreak that infected 100,000 people, and killed 400. This spurred the city to immediately install powerful UV sterilization equipment in their treatment plants. [the morality rate would have been MUCH higher had the health care and pharmaceutical system been crippled or destroyed]
    The Steri-Light units are proven very effective. Mine will handle a flow rate of 8 gallons per minute of biologically unsafe water, provided it is filtered down to no more than 5 microns in particulates. My system filters down to one micron (absolute) which captures Giardia and Crypto, and many bacteria. The in-line chlorinator and UV Steri-Light handle the rest. Production rate is 4.5 gal/min on my system because the water line is 200 feet long from the creek, and 12 feet in elevation….so the effluent gets twice the exposure time in the Steri-light. : )
    I’m forwarding this excellent write-up to friends and clients.
    Jim’s objective and straight analysis is appreciated.

  5. Aloha HJL,
    I like the well-designed MSR unit and your suggestions as to how to render it more durable are excellent.
    Have you studied the SwimforHim units? I would be interested in a side-by-side comparison. The SwimforHim units can be had for a $50 donation to the ministry; even using Math for Marines I can see that I would get up to five units for the cost of the MSR.
    Comments, Sir?

    1. @Ken,
      I did purchase one of those after I had the MSR unit. You can indeed use it, but it is definitely not as convenient as the MSR unit. You have to pour the water through the unit more than once in order to achieve the ppm that you need. The MSR is a set-and-forget unit. You fill it with the brine, push the button and wait for it to flash that it’s ready. You then have a known concentration that you can use.
      You use resulting solution per the pictorial instructions (1 scoop for 5 gal/20l or the whole batch for a 55 gal drum). We also use the whole batch in about a gallon of water when camping to form a bleach solution to disinfect dishes.
      Both systems work, I just find the MSR easier to use.

      1. Thanks Hugh.
        I appreciate the prompt answer. Great point about using a whole batch as a disinfectant or sanitizing solution. This would go well in the medical tent just for that purpose. The options are endless.
        Thanks for the review, and the reply.
        Kb

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