The oond is still looking good. The filter covers have rotted, but they have been there for 11 years. Eric hopes to replace them this year.
He had a near miss this winter when the electrics cut out. Earth trips are fitted on the house and pond. Last summer one of the pond feed pumps (Grundfos) gave up the ghost after at least eight years continuious running. Eric hung a spare punp by a string in the filters, but did not realise the weight of the pump was mainly on the cable.
After months the cable outer rubber stretched and failed and water got in but the earth trip saved the fish. The system is now running with a second hand pump.