Ciclisto Senior Member Joined: 26 Apr 2005 Posts: 242 Location: Connecticut Expertise: I love coffee
Espresso: Rancilio Silvia Grinder: Innova i2
Posted Wed Apr 6, 2011, 10:31am Subject: Re: What is the best water filter to use for a coffee machine?
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?
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.
Posted Wed Apr 6, 2011, 6:24pm 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?
signal15 Senior Member Joined: 2 Jan 2006 Posts: 115 Location: Brooklyn Park Expertise: I love coffee
Posted Wed Apr 6, 2011, 7:51pm Subject: Re: What is the best water filter to use for a coffee machine?
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..
eelpout Senior Member Joined: 19 Jan 2005 Posts: 22 Location: California Expertise: I love coffee
Posted Tue Mar 12, 2013, 1:29pm 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.
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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