Bendix W1043N front loader washing machine leaking badly?

I have just bought a second-hand Bendix and after connecting it up to the taps and cleaning out the waste filter (and carefully replacing it very tightly) I started the machine. As it was filling, it was flooding from underneath. I know it isn't the taps and I'm pretty certain it's from the waste filter. I'm not familiar with front loader washers and I be grateful for some thoughts on whether I can fix it myself. What can I do?