You can actually take the aqualifter diaphragm apart and clean or repair the the mechanism (they sell replacements for a few bucks as well, but times are tight). I always thought it would break the pump if you took the diaphragm apart, but it doesn't. In my case one of the tiny flaps inside had become dislodged over time (3yrs old), I was able to super glue it back in place and it worked like new again.
(also +1 on using a pump with the CPR - I've also heard of some people hooking the siphon line to their return pump, but I've never tried it)
-S