I put a cup of tap water with RO in my reservoir along with a pinch of baking soda to get
my alkaline levels better.
Following the long water faq. The gaggia boiler i have is aluminum.
Im getting a new machine with a copper boiler and im glad this has come
up ...i had no idea.

I found this in regards to your comment:
Most brands of RO system will reduce at least 85-90% of salts in water, so you can assume the water salts concentration would be about 1/9th of the content in the feed water. The aggressiveness of this purified water towards the materials into which it comes in contact is a function of its purity. The better the purity, the more its aggressiveness. Piping after an RO unit should therefore always be non-metallic. RO units will pass all the CO2 that is in the feed water. This means the water will be more corrosive. Dont use copper piping after any (brand of) RO system.
Reinmineralisation and pH adjustment
The desalinated water is very corrosive and is "stabilized" to protect downstream pipelines and storages usually by adding lime or caustic to prevent corrosion of concrete or cement lined surfaces. Liming material is used in order to adjust pH at 6.8 to 8.1 to meet the potable water specifications, primarily for effective disinfection and for corrosion control.


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