On Wed, 05 May 2004 00:51:00 +0000, RichToyBox wrote:

The biofilm is stubborn to wash off, and you don't want it to
be washed off. Therefore sand is a poor filter material. Find a material
that is smooth and will barely sink to make backwashing easier and the
filter run better. The bead filters are sand filters that have the water
run through in an up flow method with floating plastic beads, but there
are plastic bead media that are heavy enough to settle, and these should
be used in the standard downflow mode of a sand filter. The beads should
all be the same size to accommodate water flow without clogging.


RTB

Is that the only difference between a swimming pool sand filter and a
pond bead filter. Is there an easy way to convert a normal pool filter to
have the water flow up? Would it be a simple enough diy job? What do you
think of the efficiency of a down flow (pool) filter when filled with a
more appropriate media than sand?

Trev