Time to switch to an electric diaphragm pump
...a good bit pricier than a Jabsco
macerator pump, but by the time you've replaced two macerator pumps, you've spent more than the difference. The Dometic/SeaLand T series pump is the "pick of the litter"...Defender has it, usually for the best price
but it doesn't hurt to shop around SeaLand T-Series Pump at Defender
Jabsco also makes a diaphragm
waste pump...Xylem (who now owns Jabsco) has made it impossible find anything on their website any more, but I was able to find it on the Defender site Jabsco Waste Pump @ Defender
You'll find the owners manual at a "data sheet" button at the bottom the page.
I'd go with the Dometic T-pump. I had one on one of my own boats that was 11 years old and still going strong when I sold the boat