homecrafting, creams, toners, etc., I use 5 liter jerrycans water that’s been
distilled and deionized in accordance with some German quality standards (see picture
I also use this water to rinse i.a. measuring cylinders, the probe of the pH
meter and prepare buffer fluids for the pH meter. Even with all that I could do
(in theory) for several months with only 1 jerrycan. I throw the rest away
after 1 or 2 weeks because it doesn’t feel right to use any longer. (At work we
throw the water we use for non sterile dermatics away after 1 day, so it feels almost
awkward to use it so much longer in private!).
I can get 1 liter bottles from DIY stores, but those are in comparison insanely expensive (around 5 dollars for 1 liter of distilled water).
Another option is use 1 liter bottles of water of a lower water quality (‘demineralized’ water) from the supermarkets/drugstores (you can’t get distilled/deionized water in supermarkets/drugstores here).
(The preservatives I use the most are Phenonip
P4 (1%), Germall Liquid Plus (0,5%) and Germaben II (1%). If I use a blend of phenoxyethanol +
ethylhexylglycerin (90/10), I follow the hurdle approach (usually I combine it with
0.1-0.2% disodium EDTA, other Aw reducers like caprylyl glycol, glyceryl
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