For more than fifty years, Environment One Corporation has manufactured 1 horsepower SPD grinder pumps designed specifically for use in pressure sewer systems. From the 200 Series in the 1970s to the 2000 Series in the 1990s to today’s Extreme model, almost two million end users in over forty countries rely on E/One grinder pumps daily.


In a low-pressure sewer system, constant, predictable pump output is the foundation for proper hydraulic design. It enables the engineer to minimize retention time, pump wear, and keep scouring action at effective levels. 

The system pressures to be overcome by any given grinder pump in a low-pressure sewer system vary dramatically over the course of a day. E/One’s progressing cavity pump readily accommodates these pressure variations while maintaining a nearly constant flow without ever operating at “near shut off”—thus avoiding the wear and motor burnout suffered by other pump types.

E/One’s SPD pump has a nearly vertical H-Q curve. It is by far the most “forgiving” pump design—providing predictable flow over the full range of typical system pressures; strengths critical in large-scale, low pressure sewer systems.

E/One’s superior high head capability allows a system to have few, if any, lift stations. And, it easily accommodates additional future connections without compromising system performance. E/One grinder pumps offer reliable operation from negative heads to 185 feet of total head.


Pressure sewer systems are cost-effective and can be installed in any terrain—flat, wet, rocky, even on sites with dramatic elevation changes. They are much more affordable than conventional gravity sewers, which require major excavation, and much safer for communities than septic systems, which can eventually fail, polluting ground and recreational water and endangering public health. Pressure sewer systems can cost as much as 80 percent less to install vs gravity sewers and reduce the number of lift stations required—or even eliminate lift stations altogether. 


E/One sewer systems have been chosen for septic-to-sewer conversion projects both in the United States and abroad, especially in coastal areas where the soil is not conducive to septic tank usage and as sea levels rise. At Rincon Point in California, failing septic tanks at oceanfront homes polluted the ocean. Surfers were getting sick and avoided the water after rainstorms. One resident could see the tide rise and fall inside his septic tank. Septic tanks were replaced with the E/One sewer system, resulting in a cleaner ocean.


E/One offers its grinder pump as a replacement for existing pressure sewer systems. E/One grinder pumps use integrated pressure switches instead of floats, which are less susceptible to grease buildup and eliminate nuisance alarms that result from stuck floats. The Upgrade is a one-piece pump that installs quickly and easily into the existing tank.

Environment One’s Upgrade, the aftermarket grinder pump that works and goes on working without any preventive maintenance. It’s the original grinder pump design, the one others have tried to copy but they just haven’t gotten it right. Maybe that’s why E/One’s Upgrade has been the pump of choice for many pressure sewer upgrade projects in the mountains of Tennessee, the lakes of the Midwest, and many coastal communities.

For more information, visit eone.com.