Before I ask my question I would like to say how much I am enjoying the site.
My question is about your dad's descaling tank and the ratio of Kilrock to Water if he is not using it straight.
Here in the USA I have been using a powdered sulfuric acid mixture that I was given by a local jeweler. It requires mixing with water and heating it in a ceramic "crock" pot to use. Not very friendly to work with.
Today I went looking for Kilrock K on the net as it does not appear to be available locally in rural Alabama.
I was able to find it on Amazon at the below link for $126.00 for a 250 ml size bottle.
This appears to be a mite steep in price.
Is this what your dad is using and is this a normal price?
If so, how much does he make up at a time and at what ratio?