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What is the best water filter to use for a coffee machine?
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Ciclisto
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Joined: 26 Apr 2005
Posts: 242
Location: Connecticut
Expertise: I love coffee

Espresso: Rancilio Silvia
Grinder: Innova i2
Posted Wed Apr 6, 2011, 9:31am
Subject: Re: What is the best water filter to use for a coffee machine?
 

kratos06 Said:

It seems pretty unanimous that I should test the tap water with some test strips. I did call the water corp and they gave me a reading for my area of 0.89 to 1.45 millimol/L which I think can be converted into milligrams/L by timesing it by 18 which is the molecular weight of water. If that is correct, which I am a little unsure about, then the water here is actually quite soft 16 to 26 milligrams/L. It kinda sounds too good to be true though.

I have been researching the Brita C150kit. Has anyone heard about it and whether it is any good?

Also, Bombora do two types of filters:
Scale inhibitor
Water softener which works on ion exchange
Does anyone know which one would be better for filtering the most minerals out of water?

Posted April 5, 2011 link

No reason to think it isn't true.  The domestic water where I live is even softer than that.

However, you may be laboring under the misapprehension that it's always desirable to remove as much mineral as possible.  Some mineral content is good for the coffee flavor.  Water can be too soft for good brewing (mine is, I suspect).  A little scale is not disastrous -- de-scaling products are easy to use.  Filtering already-soft water so it makes poorer coffee, just to save a little wear-and-tear on the machine, is foolish, IMHO.

Unless your water actually smells or tastes bad, I'd advise you to get the machine and start making espresso with the water as it is.  It might be just fine.
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SteamPunk
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SteamPunk
Joined: 4 Feb 2011
Posts: 47
Location: Hamilton, Ontario
Expertise: I love coffee

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Posted Wed Apr 6, 2011, 5:24pm
Subject: Re: What is the best water filter to use for a coffee machine?
 

Try looking up 'Everpure' water filters
Popular use commercially, have quite a variety to choose from depending
on your requirements, with home systems too.
Not terribly expensive, considering how important they can be?
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signal15
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Joined: 2 Jan 2006
Posts: 115
Location: Brooklyn Park
Expertise: I love coffee

Posted Wed Apr 6, 2011, 6:51pm
Subject: Re: What is the best water filter to use for a coffee machine?
 

frcn Said:

I could be wrong, so check this out, but as I understand it, TDS figures can be misleading. The TDS meters will show all dissolved solids that are conductive (I think). The TDS coming out of a ion exchange will be roughly the same as the TDS going in. That is because it is, as the name suggest, an exchange of molecules. So it is important to get an analysis of what the minerals are, and not just how much exists in the water. Calcium carbonate and magnesium carbonate are the ones to check for as these are the ones that scale..

Posted April 5, 2011 link

This is true.  Sorry, I should have clarified that in my post.  This is why I had my water tested by Ward.
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eelpout
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Joined: 18 Jan 2005
Posts: 23
Location: California
Expertise: I love coffee

Posted Tue Mar 12, 2013, 12:29pm
Subject: Re: What is the best water filter to use for a coffee machine?
 

signal15 Said:

frcn Said:
I could be wrong, so check this out, but as I understand it, TDS figures can be misleading. The TDS meters will show all dissolved solids that are conductive (I think). The TDS coming out of a ion exchange will be roughly the same as the TDS going in. That is because it is, as the name suggest, an exchange of molecules. So it is important to get an analysis of what the minerals are, and not just how much exists in the water. Calcium carbonate and magnesium carbonate are the ones to check for as these are the ones that scale..
Posted April 5, 2011 link

This is true.  Sorry, I should have clarified that in my post.  This is why I had my water tested by Ward.

Posted April 6, 2011 link

Old thread, but I wanted to add to this. I put a cation softening filter in front of my Fiorenzato Bric. I was shocked when my TDS meter gave a much higher reading than the water that was going into it, and I was like, "What the heck?".

TDS meters look at *all* parts in their reading ("Total" duh), including sodium, whose numbers will actually increase because of the ion exchange of calcium & magnesium.
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