Long term bulk water storage

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Hi Tom

Thank you so much. May I say, you are really smart!!!!

Thank you,

Jean

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> From: silverfox_science <poast@...>

> Reply-< >

> Date: Sun, 20 Feb 2011 14:57:17 -0000

> < >

> Subject: [ ] Re: Long term bulk water storage

>

>

> Hello

>

> First you need to filter out the " big chunks. " I pour wilderness water

> through a coffee filter to do that.

>

> Next you need to determine the " oxidant demand " of the water. Most of the

> time you can mix up a 4 PPM free chlorine dioxide solution and you should be

> OK, but I have run into several cases where there was more demand in the water

> and it took a stronger concentration to purify it. This is done by mixing up

> the disinfectant, adding it to the water, letting it sit for around 10

> minutes, then testing the water to see if any of the disinfectant is still

> left in the water.

>

> Finally you need to let the water sit for the proper amount of time needed to

> kill the pathogens in the water. The better job you do at filtering, the

> quicker the pathogens are killed off.

>

> For example, the CT of 1000 used for wilderness water assumes cold water

> temperatures and the presence of cysts like giardia and cryptosporidium.

> These " large " cysts take a long time to kill and is the reason you wait the 4

> hours before drinking the water. If you do a better job of filtering and

> filter down to 1 micron, you remove these large cysts and the CT drops to 4.

> This means that using 4 PPM free chlorine dioxide your water is ready to drink

> in 60 seconds.

>

> When I go into the wilderness I carry 30 ml (1 ounce) of 5% sodium chlorite,

> 30 ml (1 ounce) of 6% hydrochloric acid, and 2 syringes that have a maximum

> capacity of 1 cc (1 cc = 1 ml). You don't want to cross contaminate the

> sodium chlorite and the HCl, so you use a separate syringe for each chemical.

> To purify 1 gallon of water you put 0.5 ml of 5% sodium chlorite into the

> gallon container and add 0.5 ml of 6% HCl, then you fill the container up with

> water. Let it sit for 10 minutes and check to make sure the " oxidation

> demand " hasn't used up all the chlorine dioxide, then let it sit for 4 hours

> and it is ready to drink.

>

> You can also go to a camping store and pick up some chlorine dioxide water

> purification tablets. With those you use 1 tablet per liter of water ( 1

> gallon = 3.8 liters).

>

> In general the " oxidation demand " is higher in water that is stagnant, smelly,

> discolored, and turbid. Also, be on the look out for dead things decomposing

> in the water.

>

> Tom

>

>

>

>>

>> Hi Tom,

>>

>> Most interesting letter!

>>

>> For a person who is not mathematically inclined, could you possibly break

>> down how to purify a gallon of water that is unknown in quality, as in

>> perhaps, river water, or well water?

>>

>> Thank you,

>>

>> Jean

>>

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