Re: Materials for filter fittings - a chemistry question

[LeeH920226 at aol_com]

In a message dated 3/8/02 11:34:46 AM, bjc3 at cornell_edu writes:

<<  Larva rock is porous but you would need special tools to see the minute 
cavities and passages in it that make it so. It is possible that anaerobic 
bacteria can make their way into the depths of the larvae rock where oxygen 
concentrations are low. The aerobic bacteria are said to be responsible for 
conversion of ammonia and nitrites to nitrates >>

A recent article (New Scientist, June 15, 2002, page 21) points out some 
recent research by a Japanese researcher that claims that a particular form 
of volcanic rock, called shirasu ignimbrite has beneficial exchange effects 
in the form of removing arsenic from drinking water by binding to the 
aluminum hydroxide surface. I wonder is other Lava rocks have similar binding 
capability. This might be more support for the deBruyn filter using Lava rock.

Lee Harper
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