E-Mail 'Letter Re: Storing Calcium Hypochlorite' To A Friend

Email a copy of 'Letter Re: Storing Calcium Hypochlorite' to a friend

* Required Field

Separate multiple entries with a comma. Maximum 5 entries.

Separate multiple entries with a comma. Maximum 5 entries.

E-Mail Image Verification

Loading ... Loading ...


  1. I too have purchase a chlorine generator instead of storing chlorine in any form. I was surprised at the cost of the unit you own. I purchased mine from http://swimforhim.org/chlorine-producing-unit/ for $50. I also donated another $50. It works fine and is easy to use. I do not have anything to compare it to so your unit may well be worth the price difference. One thing to remember is all salt water swimming pools have a chlorine generator inline with the filtration system. In a SHTF situation you might be able to scavenge a unit. Since they have no moving parts, as long as the plates are clean and you have the appropriate power source, they should work.

    1. @Travis,
      I learned of that particular unit only after I had already purchased the MSR unit. I can see why there is the price difference, but it really just depends on how much involvement you want. The MSR unit is designed to be easy to use. In effect, you have a clear bottle with instructions to add salt to a certain level, then water to a certain level. You then pour the brine into the generator to a certain level and push the button. Five minutes later, you are ready to go with chlorine. It has little LEDs that inform you of the status along the way. If you are making more than one batch, you store the chlorine solution in the brown bottle (for up to 24 hours.
      The S.W.I.M. unit is a pour-through unit. You have to repeatedly pour your brine through the device to obtain the proper concentration. While they both produce the same product, the S.W.I.M unit is a more manual process.
      The MSR is designed to be used when there may be significant communication barriers (language) between the person needing it and the person providing it (like in humanitarian efforts). You get the same end product, the MSR is just easier to use. I was happy enough with the MSR that I bought a second unit (two is one, one is none), but you will be fine with the S.W.I.M unit.

  2. How to store Calcium (or sodium) hypochlorite?


    It’s an oxidizer, and oxidizers are unstable. the hypochlorite will break down and release chlorine gradually and build up pressure within the storage vessel, and cause leaks, which will corrode any metal in the vicinity.

    I tried storing some in an acrylic jar with an acrylic lid, and silicone gasket that was closed by the traditional thick metal wire clamp. I even bent the clamp a bit to make the seal even tighter. In about 6 months I could see that the hypochlorite inside was changing and the chromed steel wire clamp was very rusty.

  3. I’ve found a reasonable solution for storing calcium hypochlortie.

    First I left it in the bag in which it was packaged. That lasted for maybe a year. It was a one pound bag. Then I noticed the bag was deteriorating and that it oxidized/corroded the 55g aluminum barrel wrench near it.

    Next I tried mason jars with the standard metal lids and rings. Those lasted a few days.

    Then I tried mason jars with tattler lids. Those deteriorated after a few days.

    I considered ground-glass stopper bottles but I was concerned if there was a build up of gas that it would push the stopper up and leak. Plus glass can break and shatter easily.

    I tried a used chlorox jug. That lasted a little while but it started to become brittle.

    Finally I tried a used laundry detergent bottle. That has successfully held about 1 cup of CH pellets (each approximately .8cm in diameter) for two years. I just checked it (outside). The color of the container has faded a little but it’s still very solid. I was letting it sit on the floor next to a metal storage rack the entire time and the rack has no signs of oxidation/deteriorate at all. I have never smelled chlorine so the cap has maintained a good seal. I should note that I gave most of the CH away (all but about a cup) to a guy that had a pool. I was concerned when I couldn’t find a storage container to safely hold it.

    I recommend you use a funnel when filling/transferring from one container to another. I cut the bottom off of the chlorox jug and used that.

    I always work outside, stand upwind, and wear safety gear. Those fumes are concentrated. Chlorine gas + water = hypochlorous acid. There is water in your eyes, nasal passages, and lungs!

  4. I purchased glass bottles with ground glass stoppers from Amazon, I only had a few bags so this was a very easy solution to storage. As I recall, they were very reasonable. I placed the jars in a short box to stabilize them and added a bunch of copied instructions on how to use it, don’t forget to label those bottles.

  5. A local (for me) Louisville KY company waterstep.org sells similar gear as part of their mission to provide safe water to communities in developing countries. A chlorine generator for $250 that can produce a gallon an hour. And a very interesting and very expensive chlorine gas generator that also produces sodium hydroxide aka lye. They call it the M-100 Chlorine Generator.

Comments are closed.