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Glad it was helpful. Interesting thoughts. I haven’t researched the issues you raise in detail, so can’t be too authoritative. On sediments – yes, it would reduce incoming sediments in shower water. But I suspect that the primary source of any sediments (eg clogging the showerhead) would be deposits flaking off old pipes, which shouldn’t be an issue inside your house. In terms of the water getting to your house, I have no idea, but would note that the bigger pipes make this less of an issue (surface area to volume ratio). One indicator as to whether this is a problem might be whether your filters and aerators at faucets have clogs or buildup.
On bacteria,the chloramine / chlorine treatments used by DC water are pretty reliable. See, eg. http://www.dcwater.com/waterquality/coliform.cfm
Unless someone in your household is immune-compromised, I wouldn’t worry, but that’s just my opinion. I would note that if this is an issue for you, you probably want a whole house filterthat has a UV treatment system. Regular filters reduce bacteria counts, but will still let some live microbes through.
The copper pipe question is interesting, and I learned something new. A number of factors related to water quality and bacteria can contribute to errosion of copper pipes. See, eg.: http://www.sciencenews.org/view/generic/id/38054/title/Science_%2B_the_Public__Holey_Copper_Pipes! [If link is broken, google “Holey Copper Pipes! ScienceNews”.]
Don’t know what aspects of a whole house filter would help or hurt here, but something new to worry about for me. 🙂
On the brushing of teeth … I do the same. If that’s really a concern and skipping the bacteria issue, maybe you should have your water tested? DC will do lead for free and you can do a mail-in kit from home depot pretty cheaply.