Thor, or should that be Zeus?

[Chaz]

Chaz I have not seen one of those so can't comment but the water should still flow through and I would expect you to have a bigger tank

At the moment im just using a plastic bucket filled with water (probably 5-6 litres) at ground level. I raised it manually by hand to lower the head distance however it made no real difference. I suspect something must be blocked but the limited flow wasnt exactly inspiring either, so I need to improve that. Without the the thin tubing, the pump pushes out a fair amount of water.