Any thoughts would be appreciated thanks, i shook my 11 litre Di vessel yest and when unscrewing the riser head i noticed the riser tube had come away from the actual screw head. Should it be able to do this because it looks like it may have broken ? I was able to push it back into the head and screw it back on though. I am new to wfp only 2nd week so unsure really. Only got the one vessel at the mo but another one coming to put two inline when first ones tds levels get to high. If the riser has broke i will have to get intouch with bayersan. Cheers in advance Ade. Great forum btw !