Franklin Electric IGP-M231-15 grinder used in the simplex package

Grinder Pumps

Grinder pumps cut household sewage into a fine slurry and push it through small-diameter pipe, uphill or over long distances, where a standard sewage ejector can't reach. They are the pump of choice for low-pressure sewer systems, homes below the sewer line and long force mains. This collection covers complete grinder pumps, ready-to-install simplex and duplex packages, and the control panels every grinder needs. Choose 1 HP for shorter, lower-head runs and 2 HP or high-head models for long or uphill mains. Not sure which fits? Run the Sump & Sewage Pump Calculator or send us your elevation and run length for an engineering-led selection. Call 1-888.510.4036 or email sales@watermainsupply.com.

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Franklin Electric Simplex Grinder Pump Control Panel - NEMA 4X, 208-230V 1Ph
Franklin Electric simplex grinder pump control panel, NEMA 4X

Franklin Electric

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Franklin Electric Simplex Grinder Pump Control Panel - NEMA 4X, 208-230V 1Ph

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Franklin Electric IGP-SMPX Simplex Fiberglass Grinder Package - Rail System, 24 in Basin
Franklin Electric simplex fiberglass grinder package with rail system

Franklin Electric

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Franklin Electric IGP-SMPX Simplex Fiberglass Grinder Package - Rail System, 24 in Basin

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Franklin Electric PowerSewer V4PS Grinder Pump Station - Low Pressure Sewer System
Franklin Electric FPS PowerSewer V4PS grinder pump station

Franklin Electric

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Franklin Electric PowerSewer V4PS Grinder Pump Station - Low Pressure Sewer System

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Franklin Electric IGPH-M Series High Head Grinder Pump - 2 HP Dual-Stage, Manual
Franklin Electric FPS IGPH-M Series high head manual grinder pump

Franklin Electric

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Franklin Electric IGPH-M Series High Head Grinder Pump - 2 HP Dual-Stage, Manual

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Franklin Electric IGPH-A Series High Head Automatic Grinder Pump - 2 HP 208-230V 1Ph
Franklin Electric FPS IGPH-A Series high head automatic grinder pump

Franklin Electric

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Franklin Electric IGPH-A Series High Head Automatic Grinder Pump - 2 HP 208-230V 1Ph

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Franklin Electric IGP Series Grinder Pump Retrofit Kit - 2 HP 208-230V 1Ph
Franklin Electric FPS IGP Series grinder pump retrofit kit

Franklin Electric

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Franklin Electric IGP Series Grinder Pump Retrofit Kit - 2 HP 208-230V 1Ph

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Franklin Electric IGP-M Series Manual Grinder Pump - 2 HP, 1-1/4 in FNPT Discharge
Franklin Electric FPS IGP-M Series manual grinder pump

Franklin Electric

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Franklin Electric IGP-M Series Manual Grinder Pump - 2 HP, 1-1/4 in FNPT Discharge

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Franklin Electric IGP-A Series Automatic Grinder Pump - 2 HP 208-230V 1Ph, 1-1/4 in FNPT
Franklin Electric FPS IGP-A Series automatic grinder pump with float

Franklin Electric

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Franklin Electric IGP-A Series Automatic Grinder Pump - 2 HP 208-230V 1Ph, 1-1/4 in FNPT

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Franklin Electric IGP-SMPXFG-HP Hard-Piped Simplex Grinder Package - 24 in Fiberglass Basin
Franklin Electric hard-piped simplex grinder package in fiberglass basin

Franklin Electric

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Franklin Electric IGP-SMPXFG-HP Hard-Piped Simplex Grinder Package - 24 in Fiberglass Basin

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Franklin Electric Duplex Grinder Pump Control Panel - NEMA 4X, Alternating
Franklin Electric duplex grinder pump control panel, NEMA 4X

Franklin Electric

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Franklin Electric Duplex Grinder Pump Control Panel - NEMA 4X, Alternating

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Franklin Electric IGP-DPLX Duplex Fiberglass Grinder Package - Rail System, 36 in Basin
Franklin Electric duplex fiberglass grinder package with rail system

Franklin Electric

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Franklin Electric IGP-DPLX Duplex Fiberglass Grinder Package - Rail System, 36 in Basin

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A.Y. McDonald Cast Iron Grinder Pump
A.Y. McDonald 1 & 2 HP Grinder Pump - Cast Iron

A.Y. McDonald

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A.Y. McDonald Cast Iron Grinder Pump

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Grinder Pumps

Grinder Pumps · Low-Pressure Sewer

Grinder Pumps & Stations

Grinder pumps cut sewage into a fine slurry and push it through small pipe, uphill and over long runs where a standard sewage ejector can’t reach. Complete pumps, ready-to-set packages and low-pressure sewer stations from A.Y. McDonald and Franklin Electric, sized by engineers.

Franklin Electric PowerSewer V4PS grinder pump station
1–2 HPGrinder Pumps
To 200 ftMax Head (High-Head Models)
33–44 GPMMax Flow
1-1/4 inDischarge
2 BrandsA.Y. McDonald · Franklin

A grinder pump sits in a sealed basin, cuts everything that comes down the drain into a slurry, and pumps it through a 1-1/4 in force main. It is the pump for homes below the sewer line, lake and hillside communities on low-pressure sewer, and any run too long or too high for a gravity line or a standard sewage ejector.

We supply bare grinder pumps for replacements, complete simplex and duplex packages, PowerSewer stations and the control panels and parts that go with them, and we size every one: send us the elevation, the force-main length and the number of homes, and we come back with the pump, the panel and the reasoning. Call 1-888.510.4036 or email sales@watermainsupply.com. All products are genuine, factory-new equipment in original manufacturer packaging, sold and supported by Watermain Supply, an independent industrial supplier.

Will It Work for Me?

The four questions that decide a grinder job, answered from the manufacturers’ data.

Warranty

A.Y. McDonald: 1 year from installation or 2 years from manufacture, whichever comes first. Franklin IGP and IGPH pumps: 2 years from original purchase. Franklin PowerSewer stations: 3 years from original purchase.

Reliability

Hardened cutters ahead of the impeller (A.Y. McDonald 440 stainless; Franklin 414,000 cuts a minute), oil-filled motors with built-in overload protection, and mechanical seals running in oil. Every pump lifts out for service; repair parts are listed.

Fit

1 HP grinders reach about 55 ft of head, 2 HP models 100 to 130 ft, and the dual-stage high-head pumps 200 ft. Most need a control panel; the automatic (A) models carry their own start parts. Discharge is 1-1/4 in on every model.

Size It Now

Enter your rise, force-main length and pipe size; the calculator returns the duty and the grinder class. Or call 1-888.510.4036.

Sump & Sewage Pump CalculatorDuty point, force-main velocity and pump class for grinder stations

How a Grinder Pump Works — and When You Need One

A sewage ejector passes solids whole and needs a 2 in or larger discharge. A grinder cuts them first, which changes what the system can do.

Choose a grinder pump when

  • The force main is long, uphill or runs to a pressurized low-pressure sewer.
  • Total head is above what a sewage ejector makes (about 25 to 30 ft for 1/2 HP ejectors).
  • The discharge has to be small pipe: 1-1/4 in or 2 in.
  • Several homes share a low-pressure sewer main.

A sewage ejector is enough when

  • The basement bathroom lifts to a gravity sewer a few feet away.
  • Total head stays under about 25 ft.
  • A 2 in discharge and a 2 in solids pump fit the job.
  • See Sewage Pumps.
Quick rule: if the water has to go up more than about 25 ft, or travel hundreds of feet through small pipe, it is grinder territory. Keep the force main at 2 ft/s or more so the slurry stays moving: about 9 GPM in 1-1/4 in pipe.

The Lines

Bare pumps for replacement and custom basins, and complete stations ready to set.

A.Y. McDonald cast iron grinder pump

A.Y. McDonald Cast Iron Grinder Pumps

1 and 2 HP · 115V or 208-230V

55–104 ftMax head
42–44 GPMMax flow
3 inSolids ground
1 HP 115VOption

Cast iron grinders with a 440 stainless cutter, a cast iron vortex impeller and an oil-filled motor; installed on a rail or on the supplied legs. The only 115V grinder here, for homes without 230V at the basin. Watermain Supply is an Authorized Stocking A.Y. McDonald and Baker Water Systems Distributor.

  • 1-1/4 in discharge, 2 in adapter optional
  • Control panel required; 120912GRP uses external capacitors
  • 20 ft quick-disconnect cord
Best forSingle-home replacements and shorter runs; the 1 HP 115V model where only 115V is available.
View A.Y. McDonald Grinders
Franklin Electric IGP-A Series automatic grinder pump

Franklin Electric IGP and IGPH Grinders

2 HP · automatic or manual · standard or high head

130–200 ftMax head
33–40 GPMMax flow
414,000Cuts per minute
1Ph or 3PhManual models

2 HP grinders in epoxy-coated cast iron with a seven-vane brass impeller. The automatic IGP-A and IGPH-A carry their own start parts and run without a panel; the manual IGP-M and IGPH-M run from a panel. IGPH models use two impellers in series for 200 ft of head.

  • 1-1/4 in FNPT discharge
  • IGP-A ships with the grinder leg kit
  • Retrofit kit for positive-displacement basins
Best forLong or high force mains, lake and hillside communities, and stations that must run without a panel.
View Franklin Grinders
Franklin Electric simplex fiberglass grinder package

Franklin Grinder Packages and Stations

Simplex · duplex · PowerSewer

24–36 inBasin diameter
To 200 ftHead (PowerSewer)
Panel + floatsFiberglass packages
RailLift-out pump

Complete stations: basin, grinder, valves and, on the fiberglass packages, the control panel and floats. The hard-piped simplex uses the automatic IGP-A and needs no panel; the PowerSewer V4PS is an HDPE low-pressure sewer station in 60 to 96 in depths.

  • Simplex, hard-piped simplex and duplex
  • Stainless rail systems on the fiberglass packages
  • PowerSewer: IGP automatic, IGP manual or IGPH high-head pump
Best forNew construction and low-pressure sewer developments that want one order and one install.
View Packages

Grinder Pumps Compared

Published maximums from each manufacturer’s literature. Read the curve at your own flow before you choose.

Model HP Voltage Max head Max flow Start parts Weight
A.Y. 110911GRP / GRPA 1 115V 1Ph 55 ft 42 GPM Panel 75 lb
A.Y. 110912GRP 1 208-230V 1Ph 55 ft 42 GPM Panel 75 lb
A.Y. 120212GRP / 120912GRP 2 208-230V 1Ph 104 ft 44 GPM Panel (120912GRP: external capacitors) 78 lb
Franklin IGP-A 2 208-230V 1Ph 130 ft 33 GPM Built in, no panel 104 lb
Franklin IGP-M 2 1Ph or 3Ph 130 ft 33 GPM Panel 75 lb
Franklin IGPH-A 2 208-230V 1Ph 200 ft 40 GPM Built in, no panel 109 lb
Franklin IGPH-M 2 1Ph or 3Ph 200 ft 40 GPM Panel 105–107 lb

Sources: A.Y. McDonald Pumps by Baker catalog rev 3/26, p. 333–334 (maximums from the published curve, rounded down); Franklin Electric IGP and IGPH literature as listed on each product page.

Verdict: Franklin wins on head: the IGPH reaches 200 ft and the automatic IGP-A and IGPH-A run without a control panel. A.Y. McDonald wins where only 115V is available (the 1 HP 110911GRP is the only 115V grinder here), on the shorter runs a 1 HP pump covers, and on flow at low head (44 GPM on the 2 HP).

Selection Guide

Application Typical duty Start here Notes
Single home, short run, 115V only Under about 40 ft of head A.Y. 110911GRP or 110911GRPA Control panel required
Single home, longer or uphill run 40 to 90 ft A.Y. 120212GRP or Franklin IGP-A IGP-A runs without a panel
Low-pressure sewer, standard head Up to about 120 ft Franklin IGP-A or IGP-M, or a PowerSewer station One station per home or small group
Hillside or long main 120 to 190 ft Franklin IGPH-A or IGPH-M Dual-stage, 200 ft shut-off
New construction, one order Any of the above Franklin simplex, hard-piped or duplex package Basin, valves and (fiberglass) panel included
Replacing a positive-displacement unit Existing basin Franklin IGP retrofit kit Match the plug: black or gray

Typical duties are guidance. The pump is chosen on its curve at your flow and total head.

Sizing a Grinder Station

Two numbers decide it: the flow that keeps the main clean, and the total head at that flow.

1. Flow

Keep at least 2 ft/s in the force main so the slurry stays in suspension: about 9 GPM in 1-1/4 in pipe and 21 GPM in 2 in. A single home rarely needs more than that; shared mains add flow per home connected.

2. Total head

Total dynamic head = the rise from the basin to the highest point of the main + pipe friction + fittings and valves + any pressure the main is held at (on a pressurized low-pressure sewer, the main’s operating pressure in feet).

Worked example: a home 30 ft below the street main, 800 ft of 1-1/4 in PVC, 15 GPM. Velocity is 3.2 ft/s (above the 2 ft/s minimum). Friction is about 3.1 ft per 100 ft, so 25 ft over the run; with about 3 ft for the check valve and fittings, TDH is about 58 ft. The 1 HP A.Y. grinder makes 43 ft at 15 GPM on its published curve: too little. The 2 HP 120212GRP makes 93 ft at 15 GPM: it covers the duty with margin, as do the Franklin 2 HP models.

Run the numbers for your site in the Sump & Sewage Pump Calculator, or send us the elevations and run length and we size the station.

What Makes a Grinder Last

Hardened cutters

The cutter sits on the suction side and reduces solids before they reach the impeller. A.Y. McDonald uses 440 stainless (56-60 Rockwell); Franklin’s cutter makes 414,000 cuts a minute.

Non-clog impellers

A.Y. McDonald uses a cast iron vortex impeller for higher head and non-overloading performance; Franklin a seven-vane, angled-face brass impeller.

Oil-filled motors

Oil cools the motor and lubricates the bearings; built-in overload protection guards against over-current and over-temperature.

Seals running in oil

Single mechanical seals in an oil-filled chamber tolerate dry running and last longer.

Automatic or manual

Automatic models carry their start parts in the pump and run from a float. Manual models keep the start parts in the panel, which is easier to service and allows three-phase.

Lift-out service

Rail systems and quick-disconnect cords let the pump come out of the basin without anyone going in.

Control Panels and Parts

Most grinders need a panel with level floats and a high-water alarm. Match the panel to the pump’s brand, voltage and amps; we confirm the match before we ship.

Franklin Electric simplex grinder pump control panel

Simplex Panel

Franklin NEMA 4X panel for one IGP grinder

 Franklin Electric duplex grinder pump control panel

Duplex Panel

Alternating control for two IGP grinders

 Franklin Electric IGP grinder pump accessories and repair parts

IGP Parts

Floats, capacitors, cutters and retrofit parts

 Campbell guide rail sewage pump disconnect

Guide Rail Disconnect

Lift the pump out without entering the basin

All parts are genuine, factory-new manufacturer parts. Franklin panels are designed for Franklin IGP grinders; for A.Y. McDonald grinders, send us the model and we specify the panel.

Why Size It With Watermain Supply

Engineering-led sizing

We work out the head and flow from your elevations and run length, then check the pump on its curve before we quote.

Multi-brand honesty

We sell A.Y. McDonald and Franklin Electric grinders. If one is not the right fit for your duty, we will say so and quote the other.

The whole station

Pump, panel, floats, basin, valves and disconnect on one order, matched to each other.

Parts and aftermarket

Cutters, capacitors, floats and repair parts listed by part number, for the pump you have.

Account terms

Net terms for contractors and utilities on approval.

Houston and Gulf Coast

Based in Houston, shipping nationwide, with people who answer the phone and size pumps.

Frequently Asked Questions

Do I need a grinder pump or a sewage ejector?

A sewage ejector is enough for a short lift to a nearby gravity sewer, under about 25 ft of head with a 2 in discharge. Choose a grinder for long, uphill or small-diameter force mains and for low-pressure sewer systems.

Does a grinder pump need a control panel?

Manual models do: the panel holds the start components, floats and high-water alarm. Franklin’s automatic IGP-A and IGPH-A carry their own start components and run from a float without a panel. The A.Y. McDonald grinders are run from a control panel.

How high can a grinder pump push sewage?

1 HP grinders reach about 55 ft of shut-off head, 2 HP standard grinders 104 to 130 ft, and Franklin’s dual-stage IGPH 200 ft. Choose on the flow at your total head, not the shut-off figure.

What size force main do I need?

Grinders discharge 1-1/4 in, and 1-1/4 in or 2 in mains are common. Keep at least 2 ft/s: about 9 GPM in 1-1/4 in pipe and 21 GPM in 2 in.

Is there a 115V grinder pump?

Yes: the A.Y. McDonald 1 HP 110911GRP and 110911GRPA run on 115V. The 2 HP grinders need 208-230V.

What is the warranty?

A.Y. McDonald grinders: 1 year from installation or 2 years from manufacture, whichever comes first. Franklin IGP and IGPH pumps: 2 years from original purchase; PowerSewer stations: 3 years.

Can I replace an old positive-displacement grinder?

Yes. Franklin’s IGP retrofit kit drops into the existing basin as one assembly; match the black or gray plug to your basin wiring.

Can you size the whole station?

Yes. Send the elevations, force-main length and pipe size, the number of homes and the power available, and we return the pump, panel, basin and fittings with the reasoning. Call 1-888.510.4036.

Ready to Size Your Grinder Station

Run the calculator, or send us the elevations and run length and we come back with the pump, panel and a quote.

1-888.510.4036Sump & Sewage Pump CalculatorEmail a Sizing RequestRequest a Quote
Technical data on this page is taken from A.Y. McDonald and Franklin Electric product literature and is subject to change by the manufacturer. Confirm against the current installation manual before specifying.
A.Y. McDonald, Franklin Electric, FPS, IGP, IGPH and PowerSewer are trademarks of their respective owners, used here for product identification only.
Watermain Supply is a DBA of E4 Industrial LLC, an independent industrial supplier based in Houston, Texas.