I am "helping" a relative sort out problems with a 5000 litre water feature which has been bedevilled by water quality problems since it was built....Its really an aesthetic water feature rather than a pond as it doesn't contain any plants or swimmers - other than those it seems to create...

To date, we have installed a Blagdon Midi Filter and Pump, and 3 self contained fountain pumps. The output from the Midi Filter drops into the pond via a cascade.


Situation - whilst the water is pretty clear, there is a residue - presumably algae forming on the the bottom. We have just replaced all the filters with the exception of the carbon one, as we have introduced King British Algae clear and understand that the carbon filter will neutralise this . Every 10 days or so the bottom is cleaned using a Pond o Vac.

As the King British doesn't seem to be having much effect, we want to introduce Viresco as it has had very good write ups. I wrote to Viresco asking if there would be a conflict with the King Brit stuff, but they weren't able to help.

Can anyone offer guidelines for the introduction of viresco - do we remove the carbon filters, turn off the UV light or just empty the pond, fill it with soil and make it into a giant planter.......

If there's anyone still awake after reading all this, we would appreciate your help