On water filters:
Later in the week I will add some detailed info about filters.
However, in the meantime, I saw crypto mentioned. Here is a small piece from a project I am working on about coffee, water and so on.
"Cryptosporidium and Giardia (Parasites) Can be found in water supplies and will not necessarily be killed in the espresso machine boiler or heat exchange unit. These parasites vary in size between 3 and 15 microns. One micron is 1/1000 mm. They can be removed by mechanical filtration. Either a sediment filter or a carbon block style filter with a rating of 0.5 micron should remove these parasites".
However, to be absolutely sure about removing these cysts, a 0.5 micron absolute cartridge is reccommended. Most cartridges sold in plumbing outlets etc have a nominal micron rating. There is a big difference between nominal and absolute. Also there is a big difference in the price.
An espresso machine boiler, might not necessarily kill cysts. I believe that cysts can take 30 plus minutes of constant boiling to kill.
HV-MAN what area are you in. I can reccommend filter experts in NSW and QLD.