Clorox degrades?

[Perk]

Seems to me I saw a post quite q while ago about how when you sanitize your fresh water tank you need to use Clorox that has not degraded. I looked up and now understand how to read the manufacture date but remembering the post that referred to the degrading I need to know what percentage of strength it looses over time. Anyone have an idea?

Thanks

 

[Gary RV_Wizard]

According to Clorox, their product has a shelf life of about 6 months at 70 degrees before any significant degradation occurs. They figure the strength decreases about 20% per year after that. Higher temps accelerate the degradation. Here is the official answer form Clorox:

    For the answer to this question, see the [email protected] email to the Director of WCMC EHS dated February 6, 2003: [which follows}

    Thank you for asking about the shelf life of Ultra regular CLOROX liquid bleach.

    When bleach and water are mixed together to create a cleaning or disinfecting solution, the solution is only good for 24 hours. The temperature of the water does not affect the cleaning or disinfecting abilities of the solution. After the 24 hours, the solution begins to lose needed disinfecting properties. Therefore, it is recommended that for disinfecting purposes, the solution is made fresh daily.

    Our bottles do not have an expiration date, however, they do have a production date. Once you understand how to read the production date, you can decipher the shelf life of the bottle. Please look below for a chart explaining our production codes.
    CODE PLANT YEAR DATE
    MD21002 MD2 1= 2001 002nd day of year
    A90288 A9 0= 2000 288th day of year

    We recommend storing our bleach at room temperatures. It can be stored for about 6 months at temperatures between 50 and 70 degrees Fahrenheit. After this time, bleach will be begin to degrade at a rate of 20% each year until totally degraded to salt and water. Storing at temperatures much higher than 70 degrees Fahrenheit could cause the bleach to lose its effectiveness and degrade more rapidly. However, if you require 6% sodium hypochlorite, you should change your supply every 3 months.

    I hope this information is helpful. Again, thank you for giving me this opportunity to discuss our product.

    Sincerely,
    Mary Brylinski Product Specialist

    MEB/cl
    3463673A