Reviews indicate these things last about a year if that. Should have read them first. No response from Neptune. They are probably tired of hearing from me after going through so many Apex units. Finally on one that works btw. So throw it in the trash and buy a Tunze? Pump has no obstructions. Looks clean just does not want to do more than spin up and stop. Ruled out all the other ATK/Apex related issues. I'm running it on full/manual.