Its only a 750 litre pond with oase all in one filterDepends on the size of the pond and the fish load. Could be every day, once a week or once a month. Clean it whenever gunk builds up in it.
Some people wait until the water flow is restricted. Some clean more often. With an appropriately sized filter, I generally clean once a week. But that can change with seasons and amount of debris getting into the pond. Also how much the fish grow and the amount you feed them both have an impact on how hard your filter has to work.
So there is no definitive answer. It's something each of us has to figure out for our particular set up. Maybe start with once a week or more often and see how it goes. Then adjust accordingly.
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