Don't know if you can answer this Marshall but I'll ask anyway out of curiosity.
Is it possible for the waste byproduct of aluminium processing plants added to 
mains water supply to contain any aluminium oxide - at all?
N.

Date: Thu, 16 Jan 2014 19:56:15 -0500
From: [email protected]
To: [email protected]
Subject: Re: CS>OT - shower filter



  
    
  
  
    Alumina is aluminum oxide, a very hard ceramic.  It has a wide range
    of uses, from grinding abrasive, plastic filler, electrical
    insulator (like for spark plugs), filter medium, paint
    filler/pigment, catalyst, and gemstones, such as rubies and
    sapphires.

    

    Marshall

    

    On 1/16/2014 6:40 PM, PT Ferrance wrote:
    
      Hi Joe,

        Is alumina the same as aluminum?  If it is wouldn't that be a
        poor choice to shower in?

        Thanks.

        PT