jgourlay
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Posts: 249
Registered: 9-7-2008
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Serious descaling
Gents, there is a wonderful invention called the 'zojirushi'. It sits quietly next to the coffee pot, keeping water hot for whenever I need it. It's
a wonderful, wonderful thing.
But, it's got a serious scale problem. Scale sticks like a barnacle to the side until it breaks off in huge chunks that floats around. It gets
nasty.
My normal solution to this would be vinegar, and attack with a rough ss scouring pad. But, this particular model has a polymer (teflon??) lining, and
I don't want to scratch that up. It's too soft even for scotchbrite.
I need a chemical solution, one that is unlikely to fubar the pump seals, that can be reliably flushed from the system so I don't poisen us, and that
will work. My first instinct was dump a shot glass of concentrated H2SO4 or HCL in there.
But I thought I'd ask here, first.
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ScienceSquirrel
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Mood: Dogs are pets but cats are little furry humans with four feet and self determination! 
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Most commercial descalers use citric acid.
Lactic, sulphamic and formic acids are also used.
Zojirushi have a product that is based on citric acid and the machine has a nifty cleaning cycle as well so put your sulphuric acid away!
http://www.zojirushi.com/products/cdk
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plante1999
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I think there is a product in north america called CLR that supposedly works.
I never asked for this.
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Pyro
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don't use H2SO4, that makes CaSO4, plaster of Paris. use HCl, but diluted.
the wisest course of action however, is to buy a descaling kit. that way there is no risk of damaging your thing.
all above information is intellectual property of Pyro.  |
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Nickdul
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A product I use commonly has these listed on the MSDS:
Citric Acid: <60%
Tartaric Acid <35%
EDTA <5%
The packaging is 250g and is supposed to be diluted with 750 to 1000ml with water. You can make out the percentages and try it.
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jgourlay
Hazard to Others
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Registered: 9-7-2008
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SWEET!!! Thanks for that!
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