On Feb 9, 6:42*pm, harry wrote:
On Feb 9, 3:10*pm, Another John wrote:





Yes - a popular topic. :-( *I realise that this is a FAQ, but technology
changes year by year, and I'm wondering what the latest views are.

I'm currently cleaning out our pond, for various reasons, but one of
them is that I want to have a real go at the damned blanket weed that
invaded several years ago, and finally got the better of us a year or
two ago.

I have drained the pond, and I'm scrubbing at the liner with a hard
floor brush, in an attempt to remove as much of the weed as possible. *
It's almost *im*possible: *traces of the weed remain no matter how hard
I scrub.

I'm aware that many "treatments" exist (I tried one a couple of years
ago), but do any of them actually work? *I'm always afraid that it might
do for other things as well as the blanket weed. *The one that I did try
(Tetrapond Algofin) had little discernible effect.

*I suspect that the consensus will be: "put up with it, and try to
remove it regularly" *:-(

Cheers
John

The reason it thrives is nitrogen in the water. This comes from
rotting plant material, fish shit and sometimes runoff water going in
your pond. If you can run rainwater from the roof directly into your
pond (nothing dissolved in it) this helps by dilution.
If you have fish, there will always be nitrogen, the only way to
eliminate it is with a filter, bacterialogal filter and UV light
thingy. They sell the sort of stuff at koi shops. Now the koi thing is
passing you can pick them up fairly cheap, also 2nd hand.- Hide quoted text -

- Show quoted text -

Growing plants, algae etc, will not eliminate the nitrogen, when it
dies it just recycles back into your pond. It is a closed sytem. The
only way to break it is by removing dead plant material, easier said
than done unless you MT the pond. And run a filter thing.