Zoeller Grinder Pumps Grind Up the Competition

No one likes clogged pipes or broken sewage systems. That’s why grinder pumps are necessary for some homes and businesses. Besides having the coolest sounding nicknames (like the Shark series we’re going to look at), grinder pumps also have the most fun videos to watch.

Thank you Zoeller for that video. I can watch that over and over. You might be asking, “what’s the difference though between a grinder pump and a sewage pump?”

The main difference between the two is the type and size of solids that can pass through the pump. Sewage pumps can pass up to 2” solids that are generally considered “softer”. Not trying to be gross here but I think you get what I mean. Grinder pumps are designed to deal with harder and thicker solids. These larger solids would clog a sewage pump, which would inevitably to lead to damage and headaches. Grinder pumps are able to handle these more difficult solids because they incorporate a cutting mechanism that macerates (grinds/chops) the solids into a fine slurry. This slurry can also be pumped higher than the solids from sewage pumps.

Grinder Pumps are often installed in a pressure sewer system using small-diameter pipes, typically 1-1/4 inch to 2 inches. They are generally housed in a sewage basin and collect the sewage from wastewater discharged from bathrooms. Wastewater and slurry is then pumped to a city sewer main or directly to a septic pump system on the property.

Whether you’re replacing an old pump or just looking for a brand new one, one name stands out above the rest, Zoeller. Zoeller grinder pumps are known for their sturdy construction, long services lives and fine cutting ability.

The Zoeller 800 Series (or The Shark Series) is one of Zoeller’s more well known and relied upon line of grinder pumps. These pumps are light, efficient models used in residential systems. They can handle typical household waste solids such as sanitary products and handwipes. Some models include the “Tri-Slice” cutter technology with three independent cutting channels that provides over 250,000 cuts per minute. Not even Guy Fieri’s knife skills are that fast. The hardened stainless steel Tri-Slice cutter provides scissor action style cutting that helps eliminate binding and roping of material around the cutter.

The Shark Series is constructed of corrosion-resistant cast iron with a powder coated epoxy finish and stainless steel hardware. The thermally protected, oil-filled motors and external cooling fins allow the pumps to run cooler. This series is available in single phase and three phase configurations.

Let’s take a brief look at one of the most popular Shark models: the Zoeller Model M803.

Zoeller Model M803

This model is a 1/2 HP submersible, grinder pump for difficult residential sewage applications where ejectors struggle. The M803 is capable of handling almost any “flushable” material you can find in your entire house. This pump has a maximum flow of 35 GPM, 35′ of max head, and has a 1-1/4″ NPT vertical discharge. The M803 runs at 115 volts and is single phase. Was the shark in Jaws inspired by this pump? Was it maybe the other way around? I’ll let you decide.


  • Oil filled for optimal heat dissipation
  • Cast iron construction
  • 1-1/4″ NPT vertical discharge
  • Engineered plastic, non-clogging, vortex impeller
  • Proven Tri-Slice cutter technology – three independent cutting channels provide over 250,000 cuts per minute
  • Stainless steel cutter and plate
  • 100% factory tested

If you’re in need of a brand new grinder pump, the Shark Series and the M803 is a good place to start looking. If this pump doesn’t suit your needs however, fear not. Zoeller has an extensive product line of grinder pumps and grinder system packages.

When you’re looking for a new Zoeller Grinder Pump, Zoeller Parts, or Zoeller Accessories, look no further than PumpProducts.com. We specialize in pumps, and we’re among the largest online dealers for Zoeller Pumps, one of the world’s top pump brands. You can also give our talented customer service pros a call at 1-800-429-0800 and they’ll be sure to help you find what you’re looking for. PumpProducts.com also happens to offer the guaranteed lowest prices you’ll find on Zoeller products!