I have a Kenmore Ultrasoft 150 that is 10 yeras old which recently does not seem to be softening the water. I have tried doing the screen and venturi to make sure they are not plugged. I also took the float assembly out and made sure there is nothing plugged in the screen there. It cycles only when I push the button for it to regenerate. The setting have not changed. The cycling begins and sounds like it is functioning but the water coming out the drain tube is a weak stream. I even took the main head unit off and checked for any blockage and have found nothing. There are no kinks in the drain tube. Salt usage is about the same as before. There is no salt bridge as I went as far as to disconnect the entire unit and flush it out completely and added new salt. Any ideas? Thanks in advance