homeburrero wrote:That is very surprising, but I can't say that I've seen tests and hard numbers. I thought that this filter had a WAC resin that was partially loaded with Mg++ ions, which were exchanged with Ca++ ions but that also softened the water via a typical WAC resin exchange with hydrogen (H+) ions. The exchange of Ca++ for Mg++ would lower your calcium hardness, but would not change the total hardness as measured by that API GH titration test. The exchange with H+ ions would be expected to reduce both your total hardness and your alkalinity by an equal amount.
Do you also test the alkalinity of your incoming water? Perhaps if that's very low it would explain the lack of softening. In any case I think it's worthwhile to ask WLL to contact the BWT folks for an explanation, ideally some example data on the effectiveness of this filter in reducing calcium hardness, and the effect on total hardness and alkalinity.
Thanks everyone for taking some interest. My water supply alkalinity is 50ppm(3d) on KH API test which is the same I got out of the filter.
Even if the filter is replacing all the calcium 1:1 with Mg, that still scales and would be a no go for protecting my machine as I understand it.
I can't dig up much any coffee specific data on the internet about BWT products except a old thread about someone in California with 300ppm GH and that his BWT setup couldn't remove about 1/2 of that and he ended up going to Chris' commericial softening setup but my water is not nearly that hard.
I was making my own water from distilled + magnesium sulfate, sodium bicarbonate, and potassium bicarbonate targeting a GH of about 40 and alkalinity around 50 and my tests showed I was on point with that, If I'm interpreting Jim Schulmans charts, to protect my steam boiler my GH really needs to be under 50 if Alkalinity is 50 or I will develop scale.