Working with the new concentrated bleach

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peterlin
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Working with the new concentrated bleach

Post by peterlin » Fri Aug 07, 2015 12:54 pm

New bleach now has 8.25 percent solution of sodium hypochlorite, up from the “regular bleach” concentration of 5.25 percent.
From what I read, we would use about a third less.

My question is what concentration to use when soaking used plastic pots, cuttings (i.e. stem prop) for lab work?

In the past I was told 10% bleach (1 part bleach and 9 part water) - easy to remember. I would reduce my 1 part by a third. Is this correct? As you can see I don't do lab work because I'm not precise in this case.
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Re: Working with the new concentrated bleach

Post by Seanhoutman » Fri Aug 07, 2015 2:42 pm

You can also increase the water part by 1/3, so 12 parts water for one part bleach. Doing some actual math though, results in the following:

5.25/10=.525
8.25/15=.555

So use 1 part new bleach, and 14 parts water, and you will have about the same concentration.

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Re: Working with the new concentrated bleach

Post by Mark » Sun Aug 09, 2015 8:10 am

I struggled with this for awhile. Burnt some stems up. Seemed to me to be harder to rinse off. I played with granulated pool chorine for awhile but that became to complicated and a hassle. Then CJ told me that he could still find the lower percentage at certain stores and bingo I found Top Shelf brand on the bottom shelf at Walmart. I'm not a big Walmart shopper but the stuff works great and its cheap. Win win.
As far as pot cleaning, I go scorched earth. The more the better. 24 hour soak in half a gallon of the new bleach to about four gallons of water in five gallon bucket. Then I float them in a rinse bucket for a few days before air drying. But with plastic pots I try to go with new and recycle the old. They aren't listed as accepted recyclable but they get them anyhow.

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Re: Working with the new concentrated bleach

Post by peterlin » Sun Aug 09, 2015 9:33 am

Thanks Mark.

Got an input from Dewey "I just found an answer from a very qualified individual who used to work for Phytotech. Do not reduce the concentration of the Clorox solution. Reduce the amount of time by 5 -10 %."
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Re: Working with the new concentrated bleach

Post by Mark » Wed Aug 12, 2015 6:32 pm

Interesting Peter, thank you. I'll remember that.

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