I have a 6,000 litre pond. It the summer it seems to get a lot more
murky than the autumn, winter and spring. I'm not sure if it is algea
or just dirty.

I have a Cyprio Prima XL 700 pump going into a PondClear UV25 (25 watt)
UV clarifier. This then goes into a green machine filter. The filer has
6 sponges and two rows of brushes. The size of the filter is 45 cms
wide by 60 cms long by 42 cms high.

Is this set-up adequeate and is there anything I can do to improve my
water quality?