<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<title></title>
</head>
<body bgcolor="#ffffff" text="#000000">
<font face="Georgia"><br>
Dear Dr. Karve, all,<br>
</font><br>
On 2/16/2011 2:08 AM, Duncan Martin wrote:
<blockquote
cite="mid:AANLkTimMEDzgSm2FjNSvOiVLbcq1V=CvJMk8YmvxUruv@mail.gmail.com"
type="cite">A wide variety of packing materials can ve used a
substrates for microbial growth in an AD filter. [...]<br>
<br>
The best packings are manufactured plastic shapes, which are
stable and have over 90% voidage. <br>
</blockquote>
<br>
There is a report extant on the internet about research done by Anne
Wilkie and her group which discusses the use of natural materials as
a platform for microbial growth in AD. (Do forgive me for not
providing a better title and a link, but lack of time does not
allow.) <br>
<br>
As well, with regard to manufactured materials, looking at places
that supply equipment for large aquariums will provide a lot of
choices. Here in the US, one might use Aquatic Eco-systems, for
example (AquaticEco.com).<br>
<br>
<br>
d.<br>
<div class="moz-signature">-- <br>
<div style="" ;=""><span style="font-size: 110%;">David William
House<br>
</span>
<div style="padding-left: 3em; font-size: 80%;">"The Complete
Biogas Handbook" <code><a href="www.completebiogas.com">www.completebiogas.com</a></code><br>
<em>Vahid Biogas</em>, an alternative energy consultancy <code><a
href="www.vahidbiogas.com">www.vahidbiogas.com</a><br>
<br>
</code></div>
<div style="padding-left: 2em;">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left: 2em; font-size: 80%;">(Rumi, a
Persian mystic poet, quoted in <em>Delight of Hearts</em>,
p. 77) <br>
<br>
<a class="moz-txt-link-freetext" href="http://bahai.us/">http://bahai.us/</a></div>
</div>
</div>
</div>
</body>
</html>