Very helpful stuff. While you were preparing that wonderful diagram I found the two plugs and took them off. It was murky in there. I blasted some air through (just a computer duster) and was eventualy able to see all the way through. I didn't take out the veturi but I will do that now. I cleaned the screen again. Thanks for tip re: the ball and more powerful backwash, I'll look into that as well.
Many thanks. I'll let you know if any of this works.......or if I need a new unit.

Cheers, Max
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