A few weeks ago I posted that my water was going green (UK-based, new pond
with waterfall (running 24/7) but no plants or fish yet until the spring)
and the general concensus was to leave it alone, which I did. Pond size is
about 8ft by 7ft and about 2 1/2 ft deep in the middle, rising to front and
back.

The water itself has now cleared but all the underwater surfaces, and I do
mean all surfaces - the liner, the underwater lights and the pump - are all
covered in a snotty, slimy, green gunk. The underwater lights are 20w
halogens and were fairly bright when we first put them in but now you would
see more light from a candle 10 miles away!

The waterfall had slowed down to about half its normal rate of flow so I
took the pump out to clean it and found it was almost completely gunged up
with this slimy green gunk. Pulling it out of the water was like lifting
your shoe after standing in some chewing gum.

I take it this is whats called "string algae"? Can I do anything or is it a
case of just leaving this alone as well?

Cheers,

Mogweed
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