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GB-1500

GB-1500

Grease Interceptor

GB-1500

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Ratings
100 GPM / 10,061 lbs
200 GPM / 9,446 lbs

Indoor / Outdoor

1,588 GAL

Liquid Capacity

Product Description

100/200 GPM grease interceptor

The lifetime guaranteed GB-1500 offers best-in-class certified grease capacity for the highest food waste producers. It is rotationally molded from high density polyethylene with deep structural contours to handle any installation scenario: above grade, buried, indoor or outdoor. Use the Fast Pitch (see FP24) riser system to bring covers to finish grade with speed and precision.

More features:

  • Rugged polyethylene tank body

  • 20% kitchen solids waste capacity

  • No flow control required, first in the industry certified to Type D of the ASME standard

  • Safety Star® access restrictor prevents accidental entry

  • Preinstalled pumpout port option available

  • Contains baffle walls (design patent pending)

  • Three manholes for increased visibility into chambers

  • Sold with temporary cover to be replaced post-install with finish cover

Listed by IAPMO to hydromechanical grease interceptor standards ASME A112.14.3 / CSA B481.1-2022 (Type D). Flow control not required.
Listed by IAPMO to gravity grease interceptor standard ANSI/CAN/IAPMO Z1001-2021

Miami DERM

Meets 99% efficiency requirement for Miami DERM:

  • 100 GPM / 9,897 lbs.

  • 200 GPM / 8,093 lbs.

High Flow factory ratings (New York & Vancouver)

  • Up to 1,500 GPM / 3,000 lbs.

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Technical Information

Flow Rate/Grease Capacity
100 GPM / 10,061 lbs
200 GPM / 9,446 lbs

Solids Capacity 318 gal

Liquid Capacity 1,588 gal

Weight 1,080 lbs

Installation Location Indoor/Outdoor

GB-1500 product image

Cover adapters can be raised or lowered 2 ½". Adapter trimming may be required for this model when lowering. See installation guide for details.

Is the GB-1500 the 'right-sized' model for you?

Accelerate your installation

With our easy-to-use, stackable riser system, your buried tank installation will go faster than ever. No cutting, no tools – just stack, twist, lock and repeat.

Learn about Fast Pitch®

Refine your installation

Once your Fast Pitch risers are set, insert and adjust your cover adapter to match finish grade with no unachievable dimensions. Adjust the cover adapter up to 5" or tilt 5 degrees in any direction for a perfectly flush-with-grade finish cover.

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Finish covers

All tanks ship with a temporary cover that must be replaced with either a P24-GI pedestrian cover or a T24-GI traffic cover. Covers are sold separately.

Safety star®

Safety Star has been redesigned to meet the standards of our new Fast Pitch riser system. It includes better structure, a molded-in center nut to fasten the temporary and pedestrian covers, locking ramp and tank product identification.

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Looking for the old me?

The Great Basin® line was redesigned and launched in July 2025. To find information on the previous version of this model, visit our "Legacy" page.

See legacy products

See our test lab

The GB-1500 is performance tested in house and third-party certified

Accessories

FP24 product image
5" tall Fast Pitch® Riser for grease interceptors with 24" covers installed below grade.
T24-GI product image
Cover, 24in Traffic Rated, Grease Interceptor System
P24-GI product image
Cover, 24in Pedestrian Rated, Grease Interceptor System
AK3 product image
Anti-flotation anchor kit for use with GB-1000, GB-1500 and all Big Foot® models.
PLAIN-EA-24 product image
4" MPT - 2" Plain End Fitting.
PLAIN-EA-34 product image
4" MPT - 3" Plain End Fitting.
FPT-EA-23 product image
3" MPT - 2" FPT Fitting.
FPT-EA-34 product image
4" MPT - 3" FPT Fitting.

Frequently Asked Questions

Are the Great Basin® indoor/outdoor units traffic rated (H-20 load rate)?

These units are traffic rated if they are installed in accordance with our installation instructions. The unit will need the T24-GI H-20 load-rated cast iron covers and a traffic-rated pad at grade per our installation detail.

Can corrugated pipe be used as a riser on the Great Basin® indoor/outdoor units?

No, corrugated pipe is not compatible with Great Basin® indoor/outdoor units. The available riser option is FP24 Fast Pitch® riser. Installing a corrugated pipe riser with this version of the Great Basin® units is not covered by the warranty.

Can the discharge from a food waste grinder be run through the Great Basin® indoor/outdoor units?

These units have solids capacity of 20% or more of the unit's liquid volume, but food waste grinders can quickly overwhelm a grease interceptor. If the food waste grinder is connected to the unit, we recommend a Billy Goat® solids interceptor in front of the grease interceptor.

Can the Great Basin® indoor/outdoor units be installed above grade (on the ground)?

All Great Basin® indoor/outdoor models can be installed above grade. The standoffs (4), which are provided standard, ensure the cover adapter(s) do not become unseated in the event of a downstream backup. A GB-500 installed above grade must also have the above grade support kit (AGS2).

Can the Great Basin® units be used with a dishwasher?

These units can be used with a dishwasher. If the dishwasher will have a discharge temperature higher than 150 degrees Fahrenheit, the system will require a drain tempering valve to reduce the water temperature.

Can you suspend the Great Basin® indoor/outdoor units with cover adapter(s) penetrating the floor above?

Yes, these units can be suspended with cover adapter(s) penetrating the floor above (with the exception of GB-1000 and GB-1500). The unit needs to be fully supported across the bottom with risers extending to the floor above. It is the responsibility of the specifying engineer or installer to design a support system appropriate for the weight of the unit with water. If suspending a GB-250, the unit must be installed with the above grade support kit (AGS1). If suspending a GB-500, the unit must be installed with the above grade support kit (AGS2).

Do the Great Basin® indoor/outdoor units need to be installed inside a vault to be buried in a high-water table area?

If the units will be installed in an area where the water table will crest the top of the tank shoulders, additional steps need to be taken to protect the unit from the extreme hydrostatic forces. The unit would need to be placed in a water tight vault or encased in concrete. If there is a possibility that ground water will come into contact with the unit, there needs to be a high-water/anti-flotation anchor kit installed (AK1, AK2, AK3).

Do the Great Basin® units require a fixture vent?

These units do not require a fixture vent. The internal design of the unit will ensure proper function without a fixture vent. Any venting to the piping connected to our unit is at the discretion of the local authority.

How many risers can be installed with a Great Basin® indoor/outdoor unit?

The maximum number of risers that can be used with a buried indoor/outdoor unit is 17 per manhole (87.5" maximum from top of tank).

How can I view legacy products?

If you're looking for legacy products, please visit the Legacy Products page

Our fixture has an air gap and discharges into a floor sink, which is overflowing. How can we fix this?

Due to the low head pressure in this scenario, the first solution is to remove the internal flow control (applies only to Type C certified units with red flow control cartridge). This flow control cartridge is provided to ensure the maximum flow rate in GPM is not exceeded in basement applications, as the unit was certified to the ASME standard and not necessary in low flow applications. If that doesn’t solve the issue, the next solution is to add a flow restrictor to the tailpiece of the fixture. Contact support@schierproducts.com for more information.

How do I calculate how many risers I need for Great Basin® indoor/outdoor units?

The adjustable cover adapters that ship with these units offer up to 5" of built-in riser height. When more is needed, each Fast Pitch® riser section provides an additional 5" in height. Use our resources here to calculate how many risers you need based on either the distance from the top of the buried tank or the centerline of the buried tank.

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