Matala Hakko HK40LP Linear Air Pump – High-Efficiency Pond Aeration
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Description
The Matala Hakko HK40LP Linear Air Pump delivers a maximum of 70 LPM (~2.47 CFM) of continuous airflow using just 40 watts of electricity — making it one of the most efficient large-output aeration pumps for koi ponds and water gardens up to 4,000 gallons. The linear diaphragm mechanism runs whisper-quiet at 32–38 dB at 1 meter, with no oil required and no vibration-intensive rotating parts.
Constructed from a durable composite resin housing rated for continuous outdoor use, the HK40LP features a side-mounted air filter for easy maintenance, industrial-grade internal components, and built-in thermal overload protection with auto restart. The LP (Low Pressure) designation means it is optimized for ponds at depths of 2–10 ft (shut-off at 14 ft). Includes a 6-foot power cord and 5/8” O.D. outlet fitting. Backed by a 3-year warranty and certified UL/CE for outdoor use.
Key Features & Benefits
Ideal Applications
- Koi ponds up to 4,000 gallons — year-round aeration and biological filtration support
- Water gardens requiring continuous dissolved oxygen levels
- Aquaculture & aquaponics — industrial-grade components for demanding production environments
- Winter aeration — maintains an open hole in pond ice to release toxic gases and prevent fish kill
- Biological filtration enhancement — increases dissolved oxygen for beneficial bacteria
- Septic tank aeration — rated for wastewater treatment applications
Technical Specifications
| Specification | Value |
|---|---|
| SKU | HK40LP |
| Max Airflow | 70 LPM (~2.47 CFM) |
| Wattage | 40W |
| Voltage | 110V standard (220V by special order) |
| Power Cord | 6 ft |
| Outlet Fitting | 5/8” O.D. |
| Noise Level | 32 dB (unloaded) / 38 dB (under load) at 1 meter |
| Recommended Pond Size | Up to 4,000 gallons (koi) |
| Ideal Depth Range | 2–10 ft |
| Shut-Off Depth | 14 ft (LP = Low Pressure) |
| Duty Rating | Continuous 24/7 |
| Housing Material | Composite resin (outdoor-rated) |
| Air Filter | Side-mounted; large; easy clean access |
| Thermal Protection | Auto off/on overload protection |
| Oil-Free | Yes — fish-safe |
| Dimensions | 204 × 174 × 215 mm |
| Weight | 11 lbs |
| Certifications | UL and CE listed (outdoor use) |
| Diaphragm Service Interval | 2–3 years under normal use |
| Warranty | 3 years (36 months) |
Hakko LP Pump Family
| Model | SKU | Max LPM | Watts | Best For |
|---|---|---|---|---|
| Hakko 25LP | HK25LP | ~25 LPM | ~20W | Smaller ponds / secondary diffuser zones |
| Hakko 40LP ← This | HK40LP | 70 LPM | 40W | Koi ponds up to 4,000 gal; 2-10 ft depth |
| Hakko 80LH | HK80LH | ~80+ LPM | ~60W | Larger ponds / deeper installations |
LP = Low Pressure (optimized for 2-10 ft depth, 14 ft shut-off). LH = Low-High pressure. For ponds deeper than 10 ft, select a high-pressure variant. ~ = approximate; verify other models before ordering.
Frequently Asked Questions
How much air does the Hakko HK40LP provide for pond aeration?
The Matala Hakko HK40LP delivers a maximum of 70 liters per minute (LPM), equivalent to approximately 2.47 CFM, using 40 watts of electricity. It is rated for ponds up to 4,000 gallons and is most effective at water depths between 2 and 10 feet. As a Low Pressure (LP) pump, it will automatically shut off when back-pressure exceeds 14 feet of water depth.
For a single-diffuser pond at moderate depth, 70 LPM provides vigorous aeration. For larger ponds or multi-zone installations, pair with a diffuser manifold and multiple air stones.
What is the benefit of a Linear Diaphragm air pump?
A linear diaphragm pump uses electromagnetic vibration to flex a diaphragm back and forth, pushing air without any rotating motor or oil lubrication. Key advantages over rotary compressors:
- Whisper-quiet — 32 dB (unloaded) to 38 dB (under load) at 1 meter; suitable for residential settings near living areas
- 100% oil-free — no contamination risk to pond water or fish
- Energy-efficient — 40 watts for 70 LPM output
- Low vibration — electromagnetic mechanism has no rotating imbalance
- Long diaphragm life — 2-3 years typical; replacement diaphragms available for in-field servicing
Does the Hakko HK40LP have internal safety features?
Yes. The HK40LP includes built-in thermal overload protection with an automatic off/on switch. If the pump overheats due to restricted airflow (clogged diffuser or air stone), elevated back-pressure, or high ambient temperatures, the pump automatically shuts down to protect the diaphragms and internal components. Once the temperature normalizes, it automatically restarts without manual intervention.
As a Low Pressure pump, it also has a built-in pressure limit — at 14 feet of back-pressure depth, the pump stops to prevent diaphragm damage. This provides inherent protection if diffusers are accidentally placed too deep.
How often should I replace the diaphragms?
Hakko replacement diaphragms typically last 2 to 3 years under continuous operation. To maximize diaphragm life:
- Clean the side-mounted air intake filter every 6 months to ensure unrestricted airflow and lower operating temperatures
- Ensure the air outlet line and diffuser are free of blockages (the leading cause of diaphragm stress)
- House the pump in a ventilated enclosure to reduce heat buildup
Replacement diaphragm kits are available for the HK40LP and can be replaced in the field without returning the pump for service, extending the useful life of the pump significantly beyond the 3-year warranty period.
Is the HK40LP weatherproof for outdoor installation?
The HK40LP features a composite resin housing rated for continuous outdoor use and is UL and CE certified for outdoor applications. The composite body resists corrosion in humid pond environments. However, like all linear air pumps, the HK40LP should be protected from direct water exposure:
- Install in a ventilated enclosure or aeration vault above water level
- Protect from direct driving rain, submersion, and flooding
- Allow adequate ventilation — the pump generates heat during operation
Always install above the water line and use a check valve on the airline to prevent backflow into the pump if power is interrupted.
Why Buy from Pond Pro Direct?
- Authentic Matala products with 3-year warranty support
- Expert aeration sizing guidance — call or text (765) 508-4352, Mon–Fri 9am–5pm EST
- Free shipping on all orders
- Price match guarantee on identical products
- 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
