Soapy water

We seem to have developed soapy water. The waterfall has been running 24/7
since December and we have no fish in the pond yet. There aren't many plants
at the moment as a friend said he would give us lots but he is off work sick
at the moment, but there are 4 oxygenators under the surface as well as what
you can see.

We had a terrible problem with blanketweed and someone recommended a
barleystraw bale which worked a treat and has been in there for about two
months. As the soapy water only appeared about a week ago I don't think it
can be down to that. And I also think it's extremely unlikely that anyone
has put detergent in there, so just what can be causing this and how do I
get rid of it?

To see what I mean, have a look he
http://www.btinternet.com/~herbie/pond.htm

Cheers,

Herbie.