If you clean it, do so with pond water. Do NOT user tap water or the
chlorine (which almost every one has now) will kill the bacteria you want to
flourish. Personally I mix the use of a bio and a veggie filter which works
very well and I only clean either if at all about once a year. I put my
pump (waterfall pump that happily takes large particles) in a 5 Gallon
bucket then fill it with lava rock. This sits bottom of the main pond.
Pump the water into anything that will hold a decent amount of plants with
lots of roots (water hyacinths for example) and that will pour back into the
main pond. You can even use a barrel liner but your GPH has to be low
enough that it doesn't overflow the lip.

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"david williams" wrote in message
...
Hi,
My bilogocal filter seems to soon fill up with a greeny brown muddy
sludge.
Should I clean it or will cleaning it destroy the bacteria I'm trying to
encourage?