The infection in the pond has worsened, we have found a number of dead fish, even though we have been treating them. So yesterday we took a sample of water to 'Water World' Swindon and had a long chat with the guys there. The water quality was fine which we where thrilled about. So a plan of action was hatched, we have to do a partial water change then add another treatment which we have been told will work with one treatment.
So we took the opportunity to use the vacuum and clear out the muck at the bottom of the pond
This is one of the really poorly fish, not that the picture shows it so well
Then whilst we where refilling the pond we also gave the pond patio a good scrub
Came up quite well I think.
With the treatment added. It turns the pond a wonderful psychedelic green. Quite impressive! So fingers and toes crossed this will work, as we have some quite old and large fish which we would be sad to lose.