Your home may need a grinder pump if the drainage system in the home is below or at the same level as the septic tank or public sewer line. This is because the waste will not be able to flow fast enough through the system on its own. It functions by grinding up waste until it forms a slurry and then pumping it through into the sewer system.
Be aware that there are quite a few items that should never be flushed down a sink or toilet if you have a grinder pump. These items include caustic or toxic chemicals, grease which will build up in the tank, plastics, diapers, feminine hygiene products, cat litter, and aquarium gravel.
Another thing to keep in mind with grinder pump maintenance is that if the home experiences a power outage, the pump will not work so try to use as little water as possible to prevent the tank from overfilling.
If you go on vacation and are away for a few days it is a good idea just before you go to run the water long enough for the pump to activate. This way it will leave clean water in the tank and help to avoid unpleasant odors.
Do not connect a grinder pump to the sump pump as this will overwork the pump and use unnecessary electricity.