Blue Thumb PB1120 Large Elite Cascade Falls Spillway Box – Pondless Waterfall Kit Filter – 22" Weir for DIY Pond Builds
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Description
The Blue Thumb PB1120 Large Elite Cascade Falls Box is a 30” spillway waterfall box engineered for Pond-Less waterfalls and traditional pond installations requiring high-flow, professional-quality water presentation. With a maximum pump rating of 7,500 GPH and a full-width black Matala diffuser mat that creates a smooth, even sheet of water across the complete 30” weir, the PB1120 is a contractor-grade Pond-Less head unit built to last. Dimensions: 20”L × 41”W × 14.25”H. Connects via two factory-installed 3” spinweld fittings. Rated for ponds up to 6,000 gallons. Place two units side-by-side for a 60” combined spillway width. Made in the USA. Lifetime Warranty.
Why Choose the Blue Thumb PB1120?
- 30” smooth waterfall sheet — black Matala diffuser mat included: The included black Matala mat sits inside the box and distributes incoming pump water evenly across the full 30” weir opening. Water exits in a smooth, uniform curtain without gaps, turbulence, or uneven flow — eliminating the “churning” effect produced by simpler waterfall boxes without internal distribution media.
- 7,500 GPH maximum pump flow: The PB1120 is engineered for pump flow up to 7,500 GPH — ideal for medium-to-large Pond-Less waterfalls and traditional pond waterfall heads. Use a pump rated within this flow range for best waterfall presentation. Two 3” factory-installed spinweld fittings accept standard PVC flex hose from the pump vault.
- Side-by-side expandable for custom widths: Two PB1120 units placed side-by-side create a 60” combined spillway. This modular design allows you to build any waterfall width from 30” up, and is a key feature of the Blue Thumb Cascade Falls Box design across all sizes.
- Detachable and reversible weir: The weir (the lip water flows over) is detachable for installation convenience — simplifying liner work during construction — and reversible to adjust the waterfall presentation. Stainless steel self-tapping screws secure all hardware, resisting corrosion through years of outdoor use.
- Landscape lid for natural concealment: The included landscape lid covers the top of the box, allowing rocks, gravel, or ground cover to be placed over the unit for a natural, fully concealed installation. The box disappears into the landscape while the waterfall remains fully functional.
- Contractor-grade construction — Lifetime Warranty: Built from reinforced contractor-grade material designed to withstand the load of heavy boulders and long-term outdoor exposure. Blue Thumb backs the PB1120 with a Lifetime Warranty and manufactures it in the USA.
- Compatible with Blue Thumb LED Light Bars: Add color-changing LED lighting (sold separately) to illuminate the 30” waterfall curtain at night for a dramatic display controllable by remote.
What’s Included
- Landscape lid (for concealing box under rocks and gravel)
- Black Matala diffuser mat (for smooth, even water dispersion over the 30” weir)
- Two factory-installed 3” spinweld fittings (inlet connections for PVC flex hose)
- Detachable and reversible weir
- Self-tapping stainless steel screws
- Black silicone (for waterproofing hardware penetrations)
- Plumbing fittings
- Full color installation instructions
Technical Specifications
| Specification | Detail |
|---|---|
| SKU | PB1120 |
| Waterfall Width | 30” spillway |
| Max Pump Flow | 7,500 GPH |
| Max Pond Volume | 6,000 gallons |
| Dimensions | 20”L × 41”W × 14.25”H |
| Inlet | Two 3” factory-installed spinweld fittings |
| Weir | Detachable and reversible |
| Diffuser | Black Matala mat (even water distribution) |
| Hardware | Stainless steel self-tapping screws (corrosion resistant) |
| Side-by-Side | Yes — expandable waterfall widths |
| LED Compatible | Yes (Blue Thumb LED Light Bars, sold separately) |
| Application | Pond-Less waterfalls, traditional ponds, streams |
| Made In | USA |
| Warranty | Lifetime Warranty |
Elite Cascade Falls Box Family — Select by Waterfall Width
All Elite Cascade Falls Box sizes share: black Matala diffuser mat, landscape lid, detachable/reversible weir, stainless steel hardware, factory-installed spinweld fittings, plumbing fittings, full color instructions, Made in USA, Lifetime Warranty, Pond-Less and traditional pond compatible, side-by-side expandable.
| Model | SKU | Weir Width | Max GPH | Dimensions (L×W×H) |
|---|---|---|---|---|
| Small Elite Cascade Box | PB1106 | 14" | 2,500 GPH | 19"×24"×14.25" |
| Medium Elite Cascade Box | — | 22" | 5,500 GPH | 20"×33"×14.25" |
| Large Elite Cascade Box (this) | PB1120 | 30" | 7,500 GPH | 20"×41"×14.25" |
| Extra Large Elite Cascade Box | — | 40" | 10,000 GPH | 19.5"×51"×14.25" |
Frequently Asked Questions
What is the weir width and maximum flow rate for the PB1120?
The Blue Thumb PB1120 Large Elite Cascade Falls Box features a 30” spillway weir and is rated for pump flows up to 7,500 GPH maximum. For a smooth, well-formed waterfall sheet, a pump in the 5,000–7,500 GPH range at your actual installation head height is ideal.
The included black Matala diffuser mat distributes incoming pump water evenly across the full 30” width before it flows over the weir, producing a consistent curtain without gaps or turbulence. For a wider combined spillway, place two PB1120 units side-by-side for a 60” waterfall width.
How does the internal mat system improve the waterfall?
The included black Matala diffuser mat sits inside the box and acts as a distribution medium. As pump water enters through the two 3” spinweld fittings, it spreads horizontally through the Matala mat before flowing over the weir. This distributes water evenly across the full 30” spillway width, preventing the “rushing to center” effect that creates narrow, turbulent waterfalls in boxes without internal distribution media.
The Matala mat also provides minor mechanical filtration, trapping larger debris as water passes through. For dedicated biological or mechanical pond filtration, a separate waterfall filter box is recommended — the Cascade Falls Box is designed for waterfall presentation, not as a primary pond filter.
What makes the Elite Series more durable than standard waterfall boxes?
The Elite Cascade Falls Box uses contractor-grade reinforced construction engineered to withstand the compressive weight of heavy boulders placed on and around it during landscape installation. All hardware is stainless steel, resisting corrosion through years of continuous outdoor operation.
Blue Thumb backs the PB1120 with a Lifetime Warranty and manufactures it in the USA.
Can this box be used for biological filtration?
The Elite Cascade Falls Box is designed as a waterfall presentation and Pond-Less head unit, not as a dedicated biological filter. The included black Matala mat provides some mechanical filtration as water passes through, but it is optimized for even water dispersion over the weir — not for the colonization of biological filter media.
For biological filtration in a traditional pond, pair the Cascade Falls Box with a dedicated waterfall filter box upstream, or use the Cascade Falls Box as the final waterfall head at the end of a stream with a biological filter box at the stream source.
Is this waterfall box compatible with LED lighting?
Yes. The PB1120 is designed to accommodate Blue Thumb LED Light Bars (sold separately). LED light bars can be positioned to illuminate the 30” water curtain from inside the box, creating a dramatic color-changing nighttime display controlled by remote or smartphone app depending on the light bar model you select.
Why Buy Blue Thumb Products from Pond Pro Direct?
- Authentic Blue Thumb products — Lifetime Warranty, Made in USA
- Waterfall sizing expertise — call for help matching pump flow, basin size, and stream design to the PB1120
- Price Match on identical Blue Thumb products from authorized retailers
Blue Thumb PB1120 Large Elite Cascade Falls Box — 30" spillway | 7,500 GPH max | 20"L×41"W×14.25"H | two 3" spinweld inlets | max 6,000 gal | black Matala mat + landscape lid + detachable/reversible weir + SS hardware included | side-by-side expandable | Made in USA | Lifetime Warranty. Pond-Less and traditional pond compatible.
Questions about waterfall sizing, pump selection, or basin design? Call or text (765) 508-4352 — Mon–Fri, 9 AM–5 PM EST.
Price Match
At Pond Pro Direct, we want you to shop with confidence, knowing you’re always getting a good deal.
We will match or beat the lowest online price on its products.
If you find a lower price for any products on our store, we will beat it by $50 for products listed over $2000. In order to be eligible, you must provide proof, whether a screenshot, invoice, email, etc. of the lower offer.
Please note that this does not apply to every product in the store, so reach out via email or chat for confirmation before purchasing.
For the policy to apply, simply send us a screenshot, link, or any other proof of the lower price.
For more information, please check out Price Match Policy Page
Shipping & Delivery
Order Processing
Orders are processed within 1–5 business days, depending on product type, brand, and fulfillment method. Products sold on Pond Pro Direct ship directly from manufacturers or authorized distribution partners and do not ship from a single centralized warehouse.
Processing times may vary by brand, item type, fulfillment method, and whether an item is made to order or ships via freight.
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Once your order is received, we contact the manufacturer or distribution partner to confirm availability and fulfillment timelines.
- If an item is unavailable or on backorder, we will notify you by email and void the pre-authorization.
- If the item is available, the payment will be processed and the order submitted for shipment.
Order Shipment
If your order is in stock and payment is processed, it will typically ship within 6–13 business days. Once your order ships, tracking information (when available) will be sent to the email address provided at checkout.
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- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
Delivery timelines may vary based on brand, item type, production status, freight requirements, and carrier availability.
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Available shipping options vary by product and location.
Our standard Curbside Delivery option is provided at no additional cost where applicable and delivers the item to the curbside or driveway of the delivery address.
Additional options, such as Threshold Delivery or White Glove Delivery, may be available for select products and locations.
For full details regarding freight delivery, inspection requirements, liftgate service, returns, and customer responsibilities, please review our full Shipping Policy page.
Returns & Refunds
Cancellations & Refunds
Orders may be canceled free of charge before shipment, unless the item is classified as Custom or Made-to-Order (see below).
If you have questions about your order, please contact us at support@pondprodirect.com or call (765) 508-4352 during business hours.
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If you need to cancel an order before it ships, please contact us as soon as possible. Orders canceled prior to shipment are eligible for a full refund.
You can reach our team by phone at (765) 508-4352, via live chat on our website, or by email at support@pondprodirect.com.
Cancellations (After Order Ships)
Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
- An RMA is required prior to returning any item
Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
- Return shipping costs are the responsibility of the customer unless the item is defective or shipped in error
- Freight / LTL shipments may incur higher return shipping costs due to carrier fees
- Approved returns of non-defective items may be subject to a restocking fee of up to 25%
- Original outbound shipping charges are non-refundable
If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
