Skip to comments.Disinfection with Calcium Hypochlorite
Posted on 09/13/2012 12:27:48 PM PDT by Kartographer
This journal entry is a continuation of my series of entries on disinfection of drinking water. Please read the following linked articles first, Introduction to Disinfection and Disinfection with Sodium Hypochlorite. I have covered a lot of background information already, which you will need to fully understand this journal entry. Go ahead, Ill wait.
Calcium Hypochlorite, Ca(OCl)₂ is a solid chemical used as a disinfectant and bleaching agent. It is used to store chlorine for long periods of time without having to resort to chlorine gas, which is extremely dangerous if not handled properly. If stored is a room temperature environment away from moisture, temperature extremes and direct sunlight, calcium hypochlorite can last up to a year without serious degradation. Beyond a year the chemical will become weaker with time.
Calcium hypochlorite is very similar to sodium hypochlorite. The biggest difference is in the appearance. Calcium hypo is a white powder and sodium hypo is a yellow liquid. Sodium hypochlorite is a liquid and can be added directly to water for disinfection. Calcium hypochlorite on the other hand, needs to be mixed into solution first. Then added to the water for disinfection.
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I think Costco had some big buckets of this stuff when I was in there last.
I’ve got a boatload of both dichlor and trichlor (pool shock). Does your pdf manual have instructions on using those?
They store forever, and a box the size of a dictionary would purify a small city’s worth of water.
Here’s a link for using dichlor:
By coincidence, I just added some to the stash last week. I thought it was supposed to be ‘good’ (only slightly diminished effectiveness) for up to about three years, if kept dry and somewhat sealed from the atmosphere though.
Thank you for the ping, Kart, as always.
Has anyone actually used this stuff? I’d be interested in hearing first=hand commentary.
*bump* clean water, how to
I use Shcl every day. We use about 2 1/2 gallons to disinfect 50,000 gallons of water. Get a cheap test kit from Hach, so you know when it’s “right.”
I figured the powdered or tablet stuff would last a lot longer. Store it right!
We use the granulated stuff for sanitizing new potable water tanks (think 100s of thousands gallon size).
My Manual only instruction on the use of Calcium Hypochlorite.
I have. you take one heaping half teaspoon to 1 gal jug of water. let it sit for i think about 3 to 4 hours. This will purify 100 gallons of water. i buy 76% which is hard to find. i bag does 10,000 gallons. i have 7 bags for prep. i dont think sams sells calcium only sodium. good luck
Not all pool shock has the correct ingredients. Anything with an algeacide in it also shouldn’t be used.
To make a stock of chlorine solution (do not drink this!) dissolve 1 heaping teaspoon (about one-quarter of an ounce) of high-test (78%) granular calcium hypochlorite for each two gallons of water.
What about the people who read your post and now believe they need to add over a pound and a half of calcium hypochlorite to a gallon of water to make a disinfecting solution?
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