FWIW, we have an issue that has lately caused some concern among our local groundwater users regarding naturally occurring Chromium 6. We are talking about in the "parts per billion" but like Arsenic (which we do not have) even those levels are now causing some concern. (IMHO overblown, but that's another story).
At any rate we tested 4 or 5 different brands of RO units, of various service ages. Best was removal of Cr6 to Non Detectible levels, worst was a 95% removal. Price range was $160 to $1200 with no apparent difference in performance in fact the least expensive unit was one of the units that got to ND. Of course that is a limited sample. If you do some searching, you will see that RO units are pretty much the only "Point of Use" units approved by most states for Arsenic and Chromium removal. Also distillers which are kind of rare, but apparently more folks are starting to use them.
For large volume treatment of source or waste water, like someone mentioned, Floculation and Filtration is used, also Weak Based Anion, and Strong Based Anion. Other technologies are also under study. Primary use of large RO units is for desal plants.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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