While they both may sound like they are interchangeable and do the same thing, they are not. They have different operations to eliminate raw sewage. Let me quickly go over each type and then try to help you decide which one you should get.
Sewage Ejector Pumps
Theis type of pump is basically used to pump raw waste to a septic or sewer from your home. So therefore, sewage ejector pumps are usually limited to maximum distance of 750 feet. One of the main advantages of an ejector pump is that its design allows it to displace around 200 gallons of raw waster per minute.
Now that’s a lot of waste.
When compared to a grinder pump this relatively high because septic pumps are considered low volume pumps. But unlike grinder pumps this type of high-volume pumps operate under low pressure.
So, in summary while Sewage ejector pumps and Grinder pumps do the same thing, they just use different techniques to do this. In terms of structural design sewage ejector pumps lack griding blades which are available on a grinder pump just like the name suggests. An ejector pump uses impellers instead that displace the raw waste through the bottom by spinning. This spinning motion creates a pressure build up which causes the waste through the discharge pipe.
Sewage Grinder Pump
While Sewage ejector pumps are low in pressure but high in volume, grinder pumps are completely the opposite. They are ideal for displacing small volumes of waste but at high pressure and over long distances. If your goal is to move the water into a sewer main which is pressurized, a grinder pump will allow you do to that.
As the name suggest the grinder pump have blades that” grind” waste which result in slurries that are easy to move. After the grinding it is then moved to the sewer main.
If you have a septic tank system, using a grinder pumpis not recommended because the grinding action causes the solids to finely grind and so it doesn’t separate when inside the septic tank. Because there’s no separation, the waste doesn’t move into the secondary tank.
Grinder pumps are more expensive and most of the sewer grinder pumps available on the market requires more power. Therefore, is best suited for a commercial application rather than residential plots. It is ideal for motels where people tend to flush everything down without considering the after effect.
Which one should I pick?
To identify which pump is best suited for you, first you should define your needs like the volume of waste to be pumped, where it is being pumped to and how far away is it.
Chances are if it’s for a house you might not need a grinder pipe because you won’t pump into a pressurized main. Most houses have septic tanks and an ejector pump is ideal but depending on the volume this can change. For a commercial situation a grinder pump is ideal.
Always contact a plumber or professional before deciding.