). It was here that I heard about using lava rocks.


I have been using lava rocks in my veggie filters for almost 10 years, and
still love them. I only clean the gunk off the bottom and the rock every 2
years, and the main ponds every 5 years.....this is my only sorce of filter
Jerri

http://www.fringeweb.com/Ponds/JerrisPond