When getting some bleach to have around for emergency water disinfection, do not use granular forms of sodium hypochlorite, unless you know what you are doing,
because the stuff is very dangerous in its concentrated powder form and must first be diluted.
Also, many granular household bleaches either are different chemicals or contain other chemicals so do not use them and consider them poisonous. NOTE: if you want a dry source of chlorine use calcium hypochlorite, as discussed further below. (Source, Unknown ... but Great advice!!)
Should you want a lot of chlorine based product, or want some that will not go bad any where near as fast, get dry calcium hypochlorite [Ca(ClO)2]. You should be able to get it from nearly any swimming pool or spa provider or a specialty chemical house. Swimming pool chemical providers often sell it labeled as HTH (for "high-test hypochlorite") or "pool shock." Make sure you are getting pure calcium hypochlorite with nothing else added
, i.e. no anti-fungals or clarifiers, etc.
Pure calcium hypochlorite provides a minimum of 65% available chlorine. Calcium Hypochlorite is not hygroscopic (does not attract water), is practically clear in a water solution, and is a stable chlorine carrier. It is rarely available in small quantities so transfer it into smaller 1 lb plastic containers that can be tightly sealed.! BE SURE TO CAREFULLY READ AND FOLLOW ALL HANDLING DIRECTIONS AND HEED ALL WARNINGS. It is always a good idea to be using calcium hypochlorite in an EXTREMELY well ventilated area, (i.e.OUTSIDE!). If calcium hypochlorite becomes contaminated by foreign substances it can cause combustion. Do not breathe the dust or get it in your eyes. This stuff is not Play Dough.
For granular calcium hypochlorite, 1oz = 50ml = 10.1 teaspoons
To treat clear raw water with 65-70% calcium hypochlorite there are a couple of ways to do it. If you want to directly treat the water with calcium hypochlorite use the following:
1 Gallon: add one grain, about the size of the period at the end of this sentence.
55 Gallons: add 1/8 teaspoon for a 5ppm solution.
400 Gallons: add 1 level teaspoon for a 5ppm solution.
To make a 5% chlorine solution to be able to use the drop method for disinfecting water, add and dissolve add ½ teaspoon of 65-70% calcium hypochlorite to ¾ cup of water. This will decay at the same rate of purchased 5.25% bleach so don't make more than you will use in a fairly short time.
Here is a detailed conversion chart for using calcium hypochlorite. http://chppm-www.apgea.army.mil/documen ... ftTBMED577
Remember, you want a residual, after treating, concentration of about 0.5 ppm so get some pdp test material.
Get a plastic ½ teaspoon and 1 pint - 1 qt plastic bottle and store with your calcium hypochlorite.
1 pound of calcium chloride will treat about 65,000 gallons of water at an initial 5 ppm concentration.
Calcium hypochlorite has the major benefit of extended shelf life. Providing it is kept dry, cool and in an airtight container, it may be stored up to 10 years with minimal degradation. If you want to keep chlorine in larger quantities or for a long time, this is the item to store.
Send me an e-mail (firstname.lastname@example.org
) if you want the complete (free) Water Report ~95 pages.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~What is the shelf life of Calcium hypochlorite?
Calcium Hypochlorite can be stored for 10 years if kept cool and dry.
Pool Shock is calcium hypochlorite. Google it. Get only 65-70% grade with no other chemicals.
BE SURE TO CAREFULLY READ AND FOLLOW ALL HANDLING DIRECTIONS AND HEED ALL WARNINGS. It is always a good idea to be using calcium hypochlorite in an EXTREMELY well ventilated area, (i.e.OUTSIDE!). If calcium hypochlorite becomes contaminated by foreign substances it can cause combustion. Do not breathe the dust or get it in your eyes. This stuff is not Play Dough.
Big, Bid Ditto. As part of my SWAT training I saw a demo of what this stuff can do. It is especially volatile with petroleum biproducts - like brake fluid, oil and all the other stuff you keep on the shelf just above the pool chemicals. All it takes is a leak, or an accidental spill and you can kiss your house goodbye.
[snip] .....you can really get a nasty wiff of this stuff. Burns your throat and eyes...[snip]
If the smell/taste of the chlorine is all you find objectionable, this can be removed by letting the chlorinated water "stand" and evaporate some chlorine several hours, or aerating the water by pouring it back and forth between two containers for a while to liberate some of the chlorine. So you do not need to filter the water unless you want to. Source: Bruss01,Avian Flu Talk, http://www.avianflutalk.com/forum_posts ... D=963&PN=2