Filter recommendations for 500 litres?

[fishdok]

sorry for the consistent posting but i feel like this is the best way to get ideas , im thinking of buying a fibre glass 500 litre pond , and want a good qaulity but not overpriced filter , any recommendations?

 

[chagoi]

Before you buy a 500 liter pond. Think about it, if you are like the rest of us soon you will want a larger pond. If you get a 500 liter tub you can use it for a QT/Hosp. I would think the same way about a filter buy one on sale in the fall. You have the bio get the water to pass throw mechanical filter frist.