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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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