WANTED: Filter

Looking for recommendations please! Hi I have a Blagdon amphibious iq 3000-6000, have been using a Blagdon clean pond machine 10000l, I’ve had 2 units both of which the UV units havnt worked (first changed the uv bulb twice within 9 months due to water ingress - second didn’t work from new - I’ve received a refund and looking for a new filter that will work with my pump. Does anyone have any recommendations/advice please as I need to order a new one asap. Pond is currently 2000l but will be upgrading to 3500 soon. Thanks in advance.