Septic Solutions has a fine selection of pumps. I suggest using an airstone bubbler. Other bubblers I've seen take so much pressure that they will run up your electric bill & wear out the pump
prematurely. IMO, if you can't blow through the bubbler with your mouth, it is not suitable.
It looks like I will be forced into Jetting out the laterals and adding riser to my D Box. I'll put my aerator back in service into the D Box at that time. Chemicals are no longer working for my leach field.