On Sat, 24 Feb 2007 12:32:06 +0000, Gill Passman
wrote:

So, do you routinely treat the water for parasites, with PP or an
off-the-shelf product?

My drug of choice is Prazi in the spring & fall for flukes, Koizyme and
then salt. None of which affect the filter. I haven't needed to treat the
lily pond with goldfish at all... and that's where all the frogs are coming
and going. ~ jan