I have now added 30 - 40kg of alphagrog and a 400 micron filter sock to collect the muck. I have also re arranged the Brushes. The water looks dirty because i have stirred the bottom of the pond up a lot to get all of the muck out of the pond and into the filter sock.
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https://www.youtube.com/watch?v=RhJfy2bcc7o
ALL IN ONE SYSTEM - 11W UV STERILISER / 2500L/H PUMP / FOUNTAIN. Got this instead of using a standard out of pond flow through UV
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https://www.youtube.com/watch?v=WIiQN-0sBwk