Liberty Pumps

I am looking at installing a bathroom in my basement or garage.  What are some of the solutions for pumping the sewage up to the sewer or septic tank? How can I purchase replacement parts? What is the best type of pump to use in my application? What is the difference between a sewage pump and a grinder pump? Should I add a high-level alarm to my system? Can I use an automatic or mechanical vent device with a Liberty system? What size sewage basin do I need? What type of battery do you recommend for use in the Model 441 (battery back-up sump pump)? If I need to replace the oil in my pump, what type should I use? What is a pump performance curve? What does "shut-off head" mean? What is TDH (Total Dynamic Head)? What is the price of the system I'm interested in? Where can I purchase your products?