I've got some kind of buildup in there from neglect when I wasn't around. I've been flushing with various agents (jet clean, spaflush...etc) and more recently using a shopvac to blow air down the main pipe which resulted in disgusting whitish slime shooting out of the fountain. I did this a few times and the slime is minimal to non existent now, but I want to make sure everything is out. I blow out all the lines and use the shop vac to suck all residual water out.
Is there anything else I can do short of disassembling the tub and getting into the piping?