 Kockney Koi Filter Help
Hi iam new to this forum and new to pond keping ive just started my pond which is going to be around 9000 litres and am planning to use a gravity fed syestem with a bottom drain ive just brought a kockney koi 8000 filter box of ebay but iam unsure how it works it has a inlet and outlet but one is higher than the other and dont know which 1 is inlet and which 1 is outlet also could u tell me which size pump i would need to get the water back from the filter to the pond thanks in advance for ur help | 
