Aquascape 91019 AquaSurge 4000 Pond Pump – 4000 GPH Waterfall & Koi Pond Circulation Pump
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Description
The Aquascape 91019 AquaSurge® 4000 Pond Pump is a high-performance, submersible asynchronous pump delivering 3,947 GPH at a maximum head of 18.5 feet — drawing just 215 watts. Engineered for continuous 24/7 operation in pond skimmers, waterfall-filter systems, and Pondless® Waterfall vaults, the AquaSurge 4000 combines high flow with exceptional energy efficiency that saves hundreds of dollars annually over traditional magnetic-drive pumps.
A unique ceramic shaft with cooling port prevents overheating under continuous load, while a secure threaded disconnect makes winterization and maintenance easy — remove the pump from your skimmer box without touching a single hose clamp or plumbing assembly. A 1.5” MPT rotational ball output lets you fine-tune the discharge angle inside tight skimmer installations. The pump runs in either horizontal or vertical orientation; a pump stand is included for vertical positioning. Completely oil-free and fish-safe.
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| Model Number / SKU | 91019 |
| Maximum Flow Rate | 3,947 GPH |
| Maximum Head Height | 18.5 ft (18.55 ft) |
| Wattage | 215W |
| Amperage | 1.82A |
| Voltage | 120V |
| Cord Length | 20 ft |
| Motor Type | Asynchronous |
| Discharge Connection | 1.5” MPT (male threaded) — single rotational ball output |
| Fittings Included | 1.5” male coupler; multi-hose adapters (3/4”, 1”, 1-1/4”, 1-1/2”); 1.5” rotational ball output; 1.5” female coupler; pump stand |
| Dimensions (L × W × H) | 12” × 5.5” × 7” |
| Ceramic Shaft | Yes — with cooling port (prevents overheating) |
| Threaded Disconnect | Yes — tool-free pump removal |
| Orientation | Horizontal or vertical (stand included) |
| Oil-Free / Fish-Safe | Yes |
| Electrical Safety | GFCI-protected 120V grounded outlet required |
| Smart Control Compatible | Yes — Smart Control Receiver sold separately |
| Water Type | Freshwater only — NOT for pools or salt water |
| Warranty | 3-Year Limited Warranty |
| ⚠ Note: This pump has a single 1.5” rotational ball output. The AquaSurge 5000 (91020) accepts either a 1.5” or 2” adapter — the 2” connection is NOT available on the 91019. | |
Ideal Applications
- Pond skimmer systems — compact design fits all Aquascape and most third-party skimmer boxes
- Waterfall-filter systems — high torque maintains flow at elevated head heights through waterfall boxes
- Pondless® Waterfall vaults — horizontal or vertical orientation fits tight vault configurations
- Koi and goldfish ponds up to approximately 4,000 gallons
- Wetland and bog filters requiring continuous moderate-volume flow
- Pond circulation upgrades where energy efficiency and quiet operation are priorities
AquaSurge® Pump Family Comparison
| Model | Max Flow | Max Head | Watts | Outlet | Smart Control |
|---|---|---|---|---|---|
| AquaSurge 2000 (91017) | 2,000 GPH | — | 100W | 1.5” | Receiver sold sep. |
| AquaSurge 3000 (91018) | 3,000 GPH | — | 160W | 1.5” | Receiver sold sep. |
| AquaSurge 4000 (91019) ← This Model | 3,947 GPH | 18.5 ft | 215W | 1.5” | Receiver sold sep. |
| AquaSurge 5000 (91020) | 5,284 GPH | 23.6 ft | 360W | 1.5” or 2” | Receiver sold sep. |
| AquaSurgePRO 4000–8000 (45009) | Up to 7,793 GPH | — | Variable | 2” | Built-in + app |
Installation Overview
- Place the pump inside a pond skimmer, Pondless® Waterfall vault, or directly in the pond — fully submerged
- Connect the 1.5” rotational ball output to your waterfall box or filter using 1.5” flex tubing
- Use the threaded disconnect fitting for fast seasonal removal — no hose clamps to loosen
- For vertical installation, attach the included pump stand and orient the discharge upward
- Plug into a GFCI-protected 120V grounded outlet — cord reaches 20 ft from pump to outlet
- For Smart Control functionality, add the Aquascape Smart Control Receiver (sold separately)
Frequently Asked Questions
What is the maximum flow rate and head height of the AquaSurge 4000?
The Aquascape 91019 AquaSurge® 4000 delivers a maximum flow rate of 3,947 GPH with a maximum head height of 18.5 feet. For best waterfall or stream performance, use 1.5” or 2” flex tubing to minimize friction loss. The pump is sized for ponds up to approximately 4,000 gallons and pairs well with Aquascape skimmer and waterfall-filter systems.
How much electricity does the AquaSurge 4000 use?
The AquaSurge 4000 draws 215 watts (1.82A at 120V) during continuous operation — significantly more efficient than traditional magnetic-drive pumps at equivalent flow rates. Asynchronous motor technology provides high torque at higher head heights while keeping energy consumption low, saving hundreds of dollars annually compared to less efficient pump technologies.
Can the AquaSurge 4000 be used as an adjustable flow pump?
Yes. When paired with the Aquascape Smart Control Receiver (sold separately), the 91019 becomes a fully adjustable flow pump controllable via the Aquascape Smart Control App on your smartphone or tablet. You can adjust flow, set schedules, and monitor the pump remotely. An optional Universal Remote (Item #45041) is also available for wireless control without a smartphone. If you want Smart Control built in from the factory, the AquaSurgePRO (SKU 45009) includes a Smart Control Receiver as standard equipment.
Is this pump safe for koi ponds and fish?
Yes. The AquaSurge 4000 features a completely oil-free motor design, eliminating any risk of toxic leaks that could harm aquatic life. It is 100% fish-safe and plant-safe, and will not corrode or rust during continuous submersed use. The pump is an excellent choice for koi ponds where maintaining water quality and biological balance is critical.
What fittings are included and what tubing sizes are compatible?
The 91019 includes a versatile set of fittings for flexible installation:
- 1.5” MPT rotational ball output — rotates to adjust discharge angle inside skimmer boxes
- Multi-hose adapters for 3/4”, 1”, 1-1/4”, and 1-1/2” flex tubing
- 1.5” male coupler and 1.5” female coupler
- Pump stand for vertical orientation
Important: The 91019 has a single 1.5” discharge connection. The 2” adapter is included with the AquaSurge 5000 (91020) only — it is not compatible with the 91019.
How do I winterize the AquaSurge 4000?
In freezing climates, remove the pump from the pond using the threaded disconnect — no hose clamps or plumbing disassembly required. Clean the intake screen and impeller with a mild acid solution (white vinegar works well) to remove mineral scale. Store the pump in a frost-free location, ideally submerged in a bucket of water to keep the internal seals from drying out. Reinstall in spring once water temperatures rise above freezing consistently.
What warranty does the AquaSurge 4000 carry?
The Aquascape AquaSurge 4000 (91019) is backed by Aquascape’s 3-Year Limited Warranty. As an authorized Aquascape dealer, Pond Pro Direct supports this warranty. Contact us at support@pondprodirect.com or (765) 508-4352 with any warranty or product questions.
Why Buy from Pond Pro Direct?
- Authentic Aquascape products with full 3-Year Manufacturer Warranty
- Expert pump sizing support — call or text (765) 508-4352, Mon–Fri 9am–5pm EST
- Free shipping on all orders
- Price match guarantee — we will beat lower prices
- 30-day return period on eligible items
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.
Order Confirmation
After placing your order, you will receive an order confirmation email confirming that we have received your order and pre-authorized your payment method.
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.
If you do not receive shipping confirmation within 6 business days, please contact us at support@pondprodirect.com.
Shipping Destinations
At this time, we primarily ship within the United States. Some products may be available for shipment to Canada. If the website allows checkout and accepts your shipping address, the product is eligible for delivery to that location.
Changing Your Shipping Address
Address changes after an order has been processed or shipped may result in delays or additional carrier fees. Any carrier charges associated with address changes are the responsibility of the customer.
Shipping Times
All shipping times are estimates only and not guarantees.
- 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.
If an order is cancelled after it has been processed or shipped, the customer may be responsible for applicable shipping charges, freight fees, carrier return fees, and warehouse handling costs, where applicable.
Shipping Options
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.
Cancellations (Before Order Ships)
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
