I have a very small water feature (millstones in a circular trough) which is suffering from green water. There is just enough room for the water feature pump (which has a course, integrated filter) so I'm looking for ideas on how to manage the green water. I don't really want to resort to chemical solutions. I did look at standalone UV devices which might break down the algae but these all seem to be for installation in a filter - which wouldn't fit.

Can anyone advise of a solution? I'm willing to try an external canister pump/filter but I'd imagine these would all be far too powerful.

Thanks in advance.

Photo would help.

Green water is not necessarily bad. It depends on what is the cause of the green water.
What else is in the pond? How is the pond used? For sound, for wild life, for pond life.

Have you tried Barley Clear? Have you tried hydrogen peroxide?

Apologies for the lack of an image.



The water feature is used for sound primarily and contains pebbles and a couple of lights. Consequently green water is something I'd like to avoid. As previously mentioned, I'd like to avoid chemicals since wildlife (cats/birds) do splash/drink from it and I don't want to cause them any harm.

Thanks.

lb483 said:Apologies for the lack of an image.



The water feature is used for sound primarily and contains pebbles and a couple of lights. Consequently green water is something I'd like to avoid. As previously mentioned, I'd like to avoid chemicals since wildlife (cats/birds) do splash/drink from it and I don't want to cause them any harm.

Thanks.

Neither Barley Clear nor hydrogen peroxide is dangerous to animals, when used in the recommended doses. Both are used in ponds with fish and other aquatic life. You could move the feature to a shady location or you could get a couple of pond snails. But really, the Barley Clear as probably your best bet.