The OASE 750 PE fish pond should be dug into the ground level so its base and sides are well supported.
Dimensions 2100 x 1400 x 600mm deep.
This pond is 750 litres and we consider this to be the minimum volume for a few koi.
You could have an OASE filtoclear 3000 and an Aquamax 3500 pump to filter a pond of this size. Call us if you have any questions!