On Fri, 01 Aug 2003 22:55:03 GMT, ken
wrote:

I am in the midst of making my own pond filter. I was going to use
charcoal brickets from the barbeque. A friend advised me to be
careful. Does anyone out there know if this is a good idea or not? If
not, what are the possible substitutes?
Thanks for all your help.

A biofilter is simply a place for bacteria to grow on a surface. A
material that could be rinsed of algae and dead stuff would be more
practical. There are filters with broken clay pots, bio balls,
plastic pieces of a number of description that work well. Charcoal
and things that absorb ammonia worry me because some of those things
saturate and release the ammonia back into the pond under some
conditions.

Regards,

Hal