I caught a DIY "10 Things You Must Know About Ponds" program this afternoon
on TV. I was surprised to hear that "Filtration" was not one of the 10
things. sigh Years back I remember watching an episode on how to install a
pond with a stream leading into it. They simply laid two pieces of liner,
one on top of the other, to do the stream. Sometimes I wonder if the TV
talent has ever really completed one of these projects before.