Just browsing the Cafetto website and came across an article that says that Reverse Osmosis water is actually bad for coffee machines. We have an RO water filtration system at home and I had been using that for the machine as I would have assumed that filtered water would be better than unfiltered. Should I switch to tap water?
Reverse osmosis (RO) water treatment is a
filtration technique that removes practically
all particulate, chemicals and water scale
elements from the water. It is, then, almost
pure water. Four problems exist for using
this technique to solve the water hardness
problem.
1. The equipment is expensive to install.
2. It is very wasteful using large amounts of
water in the process of delivering the
RO water.
3. Many coffee experts believe it imparts a
“flat” taste to espresso. Ideally, some
level of water hardness is desirable for
taste.
4. RO water has been found to be
corrosive to equipment.The pure water
has a tendency to take up elements and
this causes corrosion of metals.
Reverse osmosis (RO) water treatment is a
filtration technique that removes practically
all particulate, chemicals and water scale
elements from the water. It is, then, almost
pure water. Four problems exist for using
this technique to solve the water hardness
problem.
1. The equipment is expensive to install.
2. It is very wasteful using large amounts of
water in the process of delivering the
RO water.
3. Many coffee experts believe it imparts a
“flat” taste to espresso. Ideally, some
level of water hardness is desirable for
taste.
4. RO water has been found to be
corrosive to equipment.The pure water
has a tendency to take up elements and
this causes corrosion of metals.


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