Hi My used second nature(tetra) doesnt suck water at all. I cleaned impeller, housing, all parts with Vingegar water solution. Soaked 'em for 5hrs...No use. I hear the rrrrrr and splutter, spulletter....rrrrrr . I removed the intake slowly as it was running , impeller still runs in vinegar water... Now , do I get a new impeller? This seems like an old model right ie:'Second nature(Tetra) whisper power filter -model 3B'. Where can I get the same impeller cheap? and how much $ approximately?! Thanks !