"CanadianCowboyİ" wrote in message
...
I use lava rocks 
They are cheap enough to just throw away rather than clean 
=====================
They're also good to help loosen a heavy clay soil. The pond crud they're
clogged with is a good fertilizer.
--
Koi-Lo.... frugal ponding since 1995...
Aquariums since 1952
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
rec.pond's FAQ are at:
http://www.geocities.com/justinm090/faq.html
~~~ }((((o ~~~ }{{{{o ~~~ }(((((o