Pumice

David Pilling pbs@pilling.demon.co.uk
Wed, 03 Jul 2013 04:03:17 PDT
Hi,

More fine material will make the medium more water retentive - the laws 
of Physics can't be avoided.

How water retentive a medium is, can be measured by a simple experiment, 
see the PBS wiki page:

http://pacificbulbsociety.org/pbswiki/index.php/…

Instead of words, which mean different things to people, it would be 
possible to quote numbers for the ideal medium for species.



-- 
David Pilling
email: david@pilling.demon.co.uk
   web: http://www.davidpilling.net/






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