On Jan 24, 7:47*pm, zad2110
wrote:
Hi,
I am fairly new to ponds and fish keeping. My step father and I built
our pond two summers ago and last summer it started leaking and we were
unable to find the leak. This spring or summer we are planning on
completely redoing our pond and try and do a better job of making a
filter. *We plan to put in a bottom drain at about 3 feet and we plan to
have about 1500 gallons total in the pond. *We have a pre-filter box
with some filter media to keep leaves and bigger stuff from clogging the
pump. I have been watching a lot of videos on DIY biofilters and would
like to know how big of a bio filter we would need to make for this size
of a pond with around 8 goldfish and 3 koi. (i do not need my water to
be extremely clean or anything i just want it to be better than it was
last year when we couldnt see 1 foot down for most of the summer) My
original thought was to make two filters from big flower pots and
position them above where i want the waterfall and then have them run
into the waterfall pond before going into the big pond. Any advice I can
get would be greatly appreciated. Thank you very much.

--
zad2110

Hi Zad. I'm been in the pond hobby for almost 30 years now. I've got
a great diagram for a bio-filter. The bio-media never has to be
cleaned and if you have a bottom drain, all you have to do is backwash
about once a month or every six weeks and clean the window screening
at the top of the filter which traps debris.

Yours Koily, Lorraine