Small Pump Canyon Extension
$189.99
Large Pump Canyon Extension
$299.99
Designed for deeper pond-less waterfall reservoirs
• Compatibility: Large Elite Pump Canyon (PB1175) only
• Overall height: 48"
• Cut measurements: 9.5", 18.75", 27.5", 38" from top lip
• Application: Underground waterfall reservoir extension
• Large Pump Canyon sold separately
• Warranty: View Blue Thumb Warranty Terms
• Compatibility: Large Elite Pump Canyon (PB1175) only
• Overall height: 48"
• Cut measurements: 9.5", 18.75", 27.5", 38" from top lip
• Application: Underground waterfall reservoir extension
• Large Pump Canyon sold separately
• Warranty: View Blue Thumb Warranty Terms
Blue Thumb | Pond-less Waterfall Components
Go Deeper Without Making Your Basin Wider
Need more underground water storage for your pond-less waterfall, but don't have room for a wider reservoir? The Blue Thumb Large Pump Canyon Extension (PB1977) lets you build a deeper basin while maintaining a compact footprint. Designed specifically for the Large Elite Pump Canyon, this 48-inch extension offers multiple cut-to-size measurements to help accommodate different reservoir depths.
48" Overall extension height
4 cut sizes Measurements from top lip
PB1175 Compatible Large Elite Pump Canyon
Why Add a Pump Canyon Extension?
More Water Storage
A deeper lined reservoir can provide additional water capacity for a pond-less waterfall system without requiring the same increase in surface area.
Flexible Basin Depth
Four published cut measurements give installers flexibility when planning the extension height for the excavation and reservoir configuration.
Designed for the Elite System
Made to pair with Blue Thumb's Large Elite Pump Canyon, helping expand the design possibilities of a compatible underground waterfall basin.
Choose the Correct Extension
Before ordering, confirm which Blue Thumb Pump Canyon you own. The Large and Small extensions are different products and should not be treated as interchangeable.
THIS MODEL
Large Pump Canyon Extension
SKU: PB1977
Height: 48"
Fits: Large Elite Pump Canyon
Designed for deeper large-system reservoir applications.
View Compatible Large Pump CanyonSmall Pump Canyon Extension
SKU: PB2354
Height: 22"
Fits: Small Elite Pump Canyon
The smaller extension is intended for the Small Pump Canyon instead.
View Small Pump Canyon ExtensionImportant Compatibility Note: PB1977 is designed for the Large Elite Pump Canyon (PB1175). It is not the correct extension for the Small or Mini Pump Canyon.
Large Pump Canyon Extension Specifications
Product Large Pump Canyon Extension
Item Number PB1977
Overall Height 48 inches
Compatible Pump Canyon Large Elite Pump Canyon — PB1175
Published Cut Measurements 9.5", 18.75", 27.5", 38"
Cut Measurement Reference Measured from the top lip
Maximum Basin Depth Up to 78" — manufacturer catalog specification
Application Pond-less waterfall reservoir extension
Understanding the Cut Measurements
The extension has an overall height of 48 inches. Blue Thumb lists four cut measurements: 9.5", 18.75", 27.5", and 38", measured from the extension's top lip.
Determine the appropriate finished configuration before cutting. These numbers describe cut measurements, not four different product sizes or four separate included extensions.
The manufacturer's catalog lists a maximum basin depth of 78 inches for the Large extension system. Actual excavation and reservoir design must account for the installed components, liner, site conditions, and required water capacity.
What You're Purchasing
PB1977 is the Large Pump Canyon Extension. It is an expansion component for a compatible Pump Canyon system, not a complete pond-less waterfall kit.
Additional Components for a Complete System
Depending on your installation, other components include:
- Large Elite Pump Canyon — PB1175
- Basin Matrix water-storage modules
- Properly sized reservoir liner and protective underlayment
- Pump, discharge assembly, plumbing, and waterfall spillway
Optional: Hudson Automatic Water Fill Kit — PB1342 for automatic water-level replenishment.
Planning Your Pond-less Reservoir
The extension allows more depth, but a successful reservoir also depends on adequate water storage, suitable matrix layout, proper liner installation, and continued access to the pump.
1
Plan the Basin
Determine the water-storage needs of the waterfall and choose an excavation layout suited to the Pump Canyon, Basin Matrix, and site conditions.
2
Determine Extension Height
Review the four published cut measurements and confirm the required assembled height before making permanent cuts.
3
Prepare the Excavation
Excavate to the planned dimensions, remove sharp objects, and install the protective underliner and rubber basin liner following the applicable installation instructions.
4
Position the Canyon System
Fit the extension into the compatible Pump Canyon configuration, position the reservoir components, and maintain access for future pump maintenance.
5
Complete and Test the System
Finish the basin and plumbing according to the system instructions. Fill and test the waterfall while checking operating water levels and all connections.
Installation Guidance: The Blue Thumb manuals explain the general Pump Canyon and pond-less waterfall installation. Confirm the extension-specific assembly and cutting method with Blue Thumb before beginning a custom-depth installation.
Water Level & Maintenance
A deeper reservoir still requires regular water-level monitoring. Evaporation and splash loss can lower the water level over time, and a pump should never be allowed to operate without sufficient water.
Keep the Pump Canyon accessible for inspection, remove debris from the waterfall and streambed, and follow Blue Thumb's seasonal maintenance recommendations. An optional automatic water fill system can reduce manual topping off when properly installed.
Installation Guides & Product Resources
Use these official Blue Thumb guides to plan the complete waterfall system and maintain it after installation.
See a Pond-less Waterfall Installation
This official Blue Thumb video demonstrates the installation process for a pond-less waterfall kit, including reservoir excavation, pump and plumbing setup, and finishing the waterfall.
DIY Cascading Falls Waterfall Installation
Official Blue Thumb pond-less waterfall installation overview. This video illustrates the general system rather than the exact PB1977 Large Pump Canyon Extension. Extension components and other equipment may be sold separately.
Need Help Planning Your Reservoir?
Not sure how deep your basin should be, how much water storage you need, or whether this extension fits your project? Blue Thumb's Sales & Tech Team can help you review your pond-less waterfall design.
Frequently Asked Questions
Which Pump Canyon does this extension fit?
The Large Pump Canyon Extension, SKU PB1977, is designed for the Large Elite Pump Canyon, SKU PB1175. It is not intended for the Small or Mini Pump Canyon.
How tall is the Large Pump Canyon Extension?
The extension has an overall height of 48 inches before any cutting.
Where are the cut measurements taken from?
Blue Thumb lists cut measurements of 9.5", 18.75", 27.5", and 38". Each is measured from the top lip of the extension. Confirm the required finished height and cutting instructions before trimming.
Does this extension include the Pump Canyon?
No. PB1977 is the extension component. The compatible Large Elite Pump Canyon (PB1175) is a separate product. Other waterfall-system components are also purchased separately.
Will a deeper reservoir always hold more water?
A deeper basin can increase available water-storage capacity, but actual capacity depends on excavation dimensions, liner configuration, matrix layout, and the space occupied by installed components.
Can I use an automatic water fill kit?
Blue Thumb's Pump Canyon Extension family is documented with an auto-fill connection provision. The Hudson Automatic Water Fill Kit (PB1342) is sold separately. Verify the intended connection and operating water level for your assembled extension configuration.
Is this a complete pond-less waterfall kit?
No. This is a reservoir extension only. A complete waterfall system also requires an appropriate Pump Canyon, liner, water-storage components, pump, plumbing, and spillway.
Where can I find installation and maintenance instructions?
Blue Thumb provides official Elite Cascading Falls installation instructions, Pump Canyon instructions, and a pond-less waterfall maintenance guide in the Product Resources section above. For extension-specific cutting or assembly questions, contact the Sales & Tech Team.
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