I had an SL50 before and if you have the overflow box that has the separation in the back you should be fine. You should never loose suction on that u-tube unless you pull it up and above the water line.
I had an SL50 before and if you have the overflow box that has the separation in the back you should be fine. You should never loose suction on that u-tube unless you pull it up and above the water line.