Thor, or should that be Zeus?

[Clive S]

8mm ordered anyways to check. I'm not sure how free flowing the water should be through the spindle, I went as far as removing the pipes and I get a slow flow, so I dont think its that.

I have known the spindle fittings to be blocked when they seal the top bit on. Take off the tubing and poke a small screw driver down the hole to see if it is restricted about 25mm down. I only use a 2 ltr tank and a very small fish tank pump around £3