in the base under the big filter is a round dome plastic piece with a screw in the centre.remove the screw and pull the top up and off.in there is 3 syphon tubes.remove them 1 by 1 and wash them out wit HOT water.refit and retry.if it still doesn't work there is a loop hose connected underneath the syphon tube and this may be blocked up.remove 1 end and blow really hard and the do the other end the same.now retry
ck, October 2009
