Madison Lapierre wrote in message . ..
Tulle is used in dressmaking. Check
http://www.teuscherboston.com/images/wed05.jpg
to see what it looks like.

We've used it for two years and it seemed to work satisfactorily. We
have a few inches of black sludge on the bottom of the filter and are
told that there should be only sand and not sludge. Any ideas on this?
Is sludge OK or is it a sign of poor filtration?

What do you think? Continue using tulle or try something else readily
available. We spent about $60 CAN on huge bundle of tulle fabric for
our 200 gallon stock tank.

Many thanks........

The nylon net[courser than tule] is very handy. I have sewn it
together to keep the leaves out and when it got too many holes I put
it in the bio-filter with the window screening, bath scrubbers and
half an eggcrate mattress pad.

My bio gets rinsced once or twice a season. The netting and screening
get clogged with algae so the filter over flows. The sludge gets
drained from the bottom.Happy water gardening.