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Thread: Shelf Life of Triple Action descaler?

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    Senior Member CafeLotta's Avatar
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    Shelf Life of Triple Action descaler?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Does anybody know what the shelf life of the "Clean Machine Triple Action descaler is?

    Found a couple of bottles at the back of the cupboard which are a few years old (maybe 6-7?).

    Don't really want to be using it if it's not actually doing anything due to possibly losing effectiveness over time?

    TripleActionDescaler.jpg

    MSDS for Clean Machine Triple Action Domestic descaler - http://www.clean-machine.com.au/imag...estic_2016.pdf

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    Senior Member Lyrebird's Avatar
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    Both citric acid and glycolic acid are quite chemically stable. Nothing microbiological is going to happen at that pH so I'd say it'll be OK to use.
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    Senior Member CafeLotta's Avatar
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    Quote Originally Posted by Lyrebird View Post
    Both citric acid and glycolic acid are quite chemically stable. Nothing microbiological is going to happen at that pH so I'd say it'll be OK to use.
    It's the other >60% undisclosed part of the solution (according to the MSDS) that's the mystery I suppose.

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    Senior Member Lyrebird's Avatar
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    Behmor Brazen - $249 - Free Freight
    Quote Originally Posted by CafeLotta View Post
    It's the other >60% undisclosed part of the solution (according to the MSDS) that's the mystery I suppose.
    Mostly water, plus a bit of detergent*. The detergent may degrade slightly over time at that pH but probably not enough to affect the function of the mix markedly (the acids do the work, the detergent just helps them get where they need to be).




    *The evidence for this is the density of the solution. Both citric and glycolic will contribute about 0.02 to SG** at 5% concentration, so there's no room for anything else. There are a few things (like ethanol) that would lower the density of the solution but they are all declarable.


    ** the density of ternary mixtures is not a linear function of the component densities but you need to delve into statistical thermodynamics to calculate the differences, at these concentrations we can safely ignore them.
    Last edited by Lyrebird; 17th May 2019 at 12:04 PM.
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