Hi everyone, the stock is in and I hope to be dropping off to Lucas and Velophile this afternoon. The northern suburbs guys can contact me to arrange pickup (can't do this weekend though) and Johnno I'll catch up with you in a week or two :beer:
Due to some confusion over the effective dilution rates for this stuff, I’ve spoken with the supplier at length and crunched the numbers, and I’ve come up with some equivalent dilution rates. I have to confess I didn’t fully appreciate just how concentrated it is, and just how little of it we need to use - you will probably never need to buy sanitiser again!
As it is, this is very concentrated, industrial grade stuff, and requires special handling. As mentioned before, it certainly cannot be shipped without the appropriate dangerous goods permit. The guy who sold it to us was extremely keen to see that everyone got a copy of the safety documentation etc. Please read it and be warned!
Herlisil FP contains 50% Hydrogen Peroxide (H2O2). That’s 10 times stronger than hair bleach, and 17 times stronger than BrewShield (each 1L bottle is equivalent to about 70 x 250ml bottles of BrewShield). The best way to handle it would probably be to dilute each litre with 4 litres of distilled or deionized water (Supercheap Auto or Kmart) to create 5L of ‘premixed’ 1:4 (10% H2O2) solution, which can be kept indefinitely and further diluted with tap water before use. This is still over 3 times stronger than BrewShield, but is much less harmful than the undiluted product if spilled, and it means you don’t have to dress up like a spaceman every time you want to mix up some fresh sanitiser. The second table below gives usage rates for this ‘premix’.
You absolutely must keep this out of your eyes and throat at all costs. Even tiny quantities on the skin will turn the skin white temporarily, although the bleaching soon disappears after washing. Larger quantities however can cause burns, and contact with vulnerable areas such as eyes, nose and throat can cause extensive damage.
If you are diluting it for storage, it is important to use distilled (or deionized) water as the impurities in tap water will cause it to react, venting oxygen and diminishing the quality of the remaining solution. It is also suggested to add one drop of phosphoric acid for each litre of water, to keep the pH below 4.0 – this helps to prolong the life of the solution. Store it cool and dry, away from sunlight and kiddies.
It is also essential to use a container with the special vented cap. The 38mm cap supplied on the bottle is a fairly standard size, you should be able to find a 5L bottle that will fit it (if you're really lucky, you'll find a 5L bottle of distilled water with a 38mm lid). Hydrogen Peroxide will constantly degrade over time, producing oxygen. However, the reaction is normally very slow and the concentrated product (and distilled/deionized solutions) should remain effective for many years if properly stored. Apparently they have tested this stuff after 12 years in storage and still found it to be in excellent condition.
Solutions for immediate use can be made up with tap water, and the resulting solution should be good for several days, but it depends a lot on the purity of your tap water. For peace of mind make up a new solution each day or two, or always use distilled water and it will keep indefinitely.
The dilution rates below are based on creating the equivalent hydrogen peroxide solution. The Herlisil ‘disinfection’ and ‘sanitation’ rates are those recommended for use in commercial breweries, where biological loading is high. For our purposes, it has been suggested that we could/should use a lower (‘domestic’) concentration, and apparently even a solution of 150ppm has been found to be highly effective. It is obviously up to you to decide what concentration you want to use, but I have listed the various dilution rates to use as a guide. I would suggest 500ppm as being a decent rate, this is equivalent to 10ml per 2L if using a 1:4 premix, or 10ml:10L if using the undiluted product.
For pedantic thoroughness I’ve included separate columns for making UP TO a specific volume of solution and for ADDING TO a specific volume of water – they are slightly different but really only an issue for the higher concentration ‘storage’ solutions. Once you get down to working concentrations the difference is negligible.
I have included a printed copy of this info along with copies of the safety sheets with each bottle.