Bringing more grey water to sump pit and replacing pump

So I’m helping a friend with his house and he has a small septic tank. Instead of paying the 40k to upgrade we decided to go with a drain field for his sump and bring both his showers to the pit. The sump is old and already struggles to bring water for the full distance of the new line before the drain field. I have a lot of experience with submersibles and jet pump but I’m not as familiar with sump pumps. What are some quality 1/2 horse 115 volt sumps? Do we maybe want to look at more of a trash pump? Thank you