For any residential application a sewage pump package needs only be a 4/10hp. Zoeller makes the best pre-plumbed package for this job.
NOW, check out www.saniflo.com for the code approved SANIPLUS model. You can add a complete bathroom without breaking up the floor. The pump will handle a shower, tub, basin and toilet. If you are planning on a large volume soaker or whirlpool tub, then you would need the SANIBEST model. I have been selling these models for years without any problems. I can ship these to you if you don't have a local distributor in your area. You can reach me at [email protected]