Kasco 3400AF 3/4 HP Surface Aerator 200 ft Cord – Floating Pond & Lake Aeration System with Float & Screen
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Description
The Kasco 3400AF 3/4 HP Surface Aerator is a high-efficiency, continuous-duty aeration unit for ponds up to 3/4 acre, achieving up to 3.0 lbs of oxygen per horsepower per hour — validated by Auburn University testing. The 120V model (3400AF) draws 6.7 amps; the 240V model (3400HAF) draws 3.4 amps. Both ship with a UV-resistant thermoplastic float, two 50' braided nylon mooring ropes, and a sacrificial zinc anode. The bottom screen and C-25/C-85 control panels are optional accessories, not included.
What's Included — Kasco 3400AF
- Kasco 3400AF 3/4 HP surface aerator motor unit
- UV-resistant thermoplastic float assembly
- Two (2) 50' braided nylon mooring ropes
- Sacrificial zinc anode (corrosion protection)
- 200 ft SJTOW underwater-rated power cord
- Cable strain relief hardware
- Owner's manual and installation guide
Technical Specifications
| Specification | 3400AF (120V) | 3400HAF (240V) |
|---|---|---|
| Horsepower | 3/4 HP | 3/4 HP |
| Voltage | 115–120V, 60 Hz | 208–240V, 60 Hz |
| Running Amps | 6.7A | 3.4A |
| Cord Length | 200 ft SJTOW underwater-rated | 200 ft SJTOW underwater-rated |
| Cord Options | 50', 100', 150', or 200' (120V); up to 500' (240V) | |
| Pond Coverage | Up to 3/4 acre | Up to 3/4 acre |
| Min. Operating Depth | 17.5 inches | 17.5 inches |
| O₂ Transfer Rate | 3.0 lbs O₂/HP/hr (Auburn University validated) | 3.0 lbs O₂/HP/hr |
| Float | UV-resistant thermoplastic — included | UV-resistant thermoplastic — included |
| Mooring Ropes | Two (2) 50' braided nylon — included | Two (2) 50' braided nylon — included |
| Zinc Anode | Sacrificial zinc anode — included | Sacrificial zinc anode — included |
| Bottom Screen | Optional — not included | Optional — not included |
| Control Panel | C-25 (optional) — 24-hr timer, GFCI, photocell | C-85 (optional) — GFCB, 24-hr timer, surge protection |
| Motor Design | Flood oil lubricated internal mechanical seal | Flood oil lubricated internal mechanical seal |
| Motor Protection | Thermal overload | ETL listed | Thermal overload | ETL listed |
| Saltwater Compatible | Yes — stainless steel housing + zinc anode | Yes — stainless steel housing + zinc anode |
| Circuit Required | Dedicated 15A GFCI-protected circuit | Dedicated 20A GFCI-protected circuit |
| Warranty | 2 years — Kasco manufacturer | 2 years — Kasco manufacturer |
| Made In | Prescott, WI — USA | Prescott, WI — USA |
Kasco Surface Aerator Series — Size Comparison
| Model | HP | Voltage | Amps | Coverage | Min Depth |
|---|---|---|---|---|---|
| 2400AF / 2400HAF | 1/2 HP | 120V / 240V | 4.7A / 2.3A | Up to 1/2 acre | 17.5" |
| 3400AF / 3400HAF ← | 3/4 HP | 120V / 240V | 6.7A / 3.4A | Up to 3/4 acre | 17.5" |
| 4400AF / 4400HAF | 1 HP | 120V / 240V | 9.1A / 4.6A | Up to 1 acre | 17.5" |
| 8400AF / 8400HAF | 2 HP | 240V only | — | Up to 2 acres | 17.5" |
Why the Kasco 3400AF?
- 3.0 lbs O₂/HP/hr — Auburn University validated. Auburn University's Standard Aeration Efficiency (SAE) testing confirmed Kasco aerators transfer at least 3.0 pounds of oxygen into the water per horsepower per hour of operation. This is the industry benchmark figure that serious pond managers and aquaculture operators use to compare aeration systems. The single open propeller design flings water droplets into the air and back into the pond, maximizing surface area contact for gas exchange — expelling methane, hydrogen sulfide, and CO₂ while absorbing atmospheric oxygen.
- Flood oil lubricated internal mechanical seal — built for 24/7 continuous duty. The 3400AF motor uses a hard-face internal mechanical seal lubricated with flood oil for heat dissipation. This design protects against shaft seal leaks under continuous operation, which is the primary cause of submersible motor failure in lesser-quality aerators. The stainless steel motor housing resists corrosion in both freshwater and saltwater applications. Thermal overload protection shuts the motor down if operating temperatures exceed safe limits and automatically restores operation when cooled.
- Two 50' braided nylon mooring ropes — installation-ready out of the box. The 3400AF ships with two 50-foot braided nylon mooring lines to anchor the floating unit from shore or dock. Most installations use two ropes to position the aerator at the optimal location — typically the deepest zone of the pond where stratification is most severe. A third rope can be added for ponds where wind loading may be an issue.
- Sacrificial zinc anode — electrolysis protection in saltwater and brackish water. The zinc anode sacrifices itself to protect the motor housing from electrolytic corrosion — the primary long-term failure mode for metal aerators in coastal, brackish, or high-mineral-content water. Inspect the anode annually; replace when visibly corroded or reduced to less than half its original size. Replacement anodes are available from Kasco.
- Optional bottom screen — add it for debris-heavy ponds. The bottom screen mounts below the float to prevent the propeller from drawing in large debris. Kasco recommends adding it for ponds with heavy leaf fall, significant algae growth, or string algae that could foul the propeller. Note: the bottom screen is not included and must be ordered separately. Call us to add it to your order: (765) 508-4352.
- 200 ft SJTOW cord — installations up to 200 feet from shore. SJTOW is an underwater-rated cord construction — suitable for continuous submersion. The 200 ft length handles most residential pond and small-lake installations where the shore power outlet is distant from the optimal aerator position. For 240V installations, cords up to 500 feet are available.
Optional Accessories
Available add-ons for the Kasco 3400AF / 3400HAF
- Bottom Screen — Protects propeller from debris. Recommended for ponds with heavy leaf fall, algae mats, or any area with swimmers. (Swimmers should not be present when aerator is running.)
- C-25 Control Panel (120V — for 3400AF) — 24-hour mechanical timer, GFCI protection, photocell outlet for LED lighting control. Mounts on shore near power outlet. Rain-proof enclosure.
- C-85 Control Panel (240V — for 3400HAF) — GFCB protection, 24-hour timer, surge protection, 120V GFI lighting outlet. Rain-proof enclosure.
- LED Aerator Lighting Kit — Submersible LED lights compatible with C-25/C-85 photocell. Available in warm white, bright white, and color-changing.
- Kasco Macrozyme Bacteria Treatment — Non-toxic bacteria and enzymes to reduce muck, neutralize odors, and improve water clarity. One 8-oz bag treats approximately 1/2 acre-foot of water.
Frequently Asked Questions
What is the oxygen transfer rate of the Kasco 3400AF?
The Kasco 3400AF is validated by Auburn University to deliver at least 3.0 lbs of oxygen per horsepower per hour (SAE — Standard Aeration Efficiency). For a 3/4 HP unit, this equates to approximately 2.25 lbs of O₂ transferred per hour of continuous operation. The open-propeller design throws water droplets into the air and forces them back into the pond, maximizing surface area for atmospheric oxygen absorption while simultaneously venting dissolved gases like methane and carbon dioxide from the water column.
How is a surface aerator different from a decorative fountain?
A surface aerator like the 3400AF is engineered for maximum oxygen transfer, not visual display. It produces a high-volume, low-profile "white water" agitation pattern — not a decorative spray. The purpose is gas exchange: expelling harmful dissolved gases and forcing atmospheric oxygen into the water as efficiently as possible. A decorative fountain like Kasco's 3400JF (same 3/4 HP) creates aesthetically pleasing spray patterns with lower oxygen transfer efficiency. If your primary goal is eliminating algae, preventing fish kills, or resolving odor problems, the 3400AF aerator is the correct choice. If you want a visual feature with some aeration benefit, the 3400JF fountain is the alternative.
Is the bottom screen included?
No — the bottom screen is an optional accessory, not included with the 3400AF. It mounts below the float to prevent the open propeller from drawing in large debris. Kasco strongly recommends adding the bottom screen for ponds with significant leaf fall, algae, or string weed that could foul the propeller. Note: the bottom screen also provides a physical guard — swimmers should never be in the water when the aerator is running regardless of screen presence. Call us to add the bottom screen to your order: (765) 508-4352.
Is a control panel included?
No — the C-25 (120V) and C-85 (240V) control panels are optional accessories. The 3400AF plugs directly into a GFCI-protected outlet without a control panel. Adding the C-25 or C-85 gives you a 24-hour mechanical timer (to run the aerator on a schedule rather than continuously), GFCI protection at the panel, and a photocell outlet for connected LED lighting. The C-25 is for 120V (3400AF); the C-85 is for 240V (3400HAF). Both are available to add to your order — call us: (765) 508-4352.
Can this aerator operate in saltwater or brackish conditions?
Yes. The 3400AF is designed for both freshwater and saltwater/brackish environments. The stainless steel motor housing resists corrosion, and the included sacrificial zinc anode protects against electrolytic corrosion — the primary long-term failure mechanism in corrosive water conditions. Inspect and replace the zinc anode annually. The 3400AF is used in commercial aquaculture, coastal ponds, industrial basins, and municipal wastewater applications.
What are the electrical requirements?
The 120V model (3400AF) draws 6.7 amps and requires a dedicated 15-amp GFCI-protected circuit. The 240V model (3400HAF) draws 3.4 amps and requires a dedicated 20-amp GFCI-protected circuit. The 200-ft cord is SJTOW-rated (underwater rated) and should run without splices to the power source. Do not use an extension cord. The optional C-25 control panel (120V) or C-85 (240V) provides built-in GFCI protection at the panel if desired. Contact a licensed electrician for outdoor pond electrical installations.
What maintenance does the 3400AF require?
The 3400AF requires minimal maintenance for 24/7 continuous operation. Inspect the motor housing periodically and clean any debris buildup from the housing surface to ensure proper heat dissipation through the stainless steel casing. Check the zinc anode annually — replace when it is visibly corroded or reduced to less than half its original mass. If a bottom screen is installed, inspect and clear it of debris as needed. The 2-year warranty covers the motor against defects in materials and workmanship for continuous-duty operation.
Why Buy From Pond Pro Direct?
- Authorized Kasco Marine dealer — full 2-year Kasco manufacturer warranty applies.
- Full Kasco aerator lineup — 1/2 HP (2400AF) through 2 HP (8400AF). Call to size for your pond acreage: (765) 508-4352.
- Bottom screen, control panel, and lighting kits available — call to add to your order.
- Price Match Guarantee — beat any lower authorized dealer price by $50 on orders over $2,000.
- Free nationwide shipping. 30-day return period. Call or text (765) 508-4352, Mon–Fri 9 AM–5 PM EST.
Kasco 3400AF 3/4 HP Surface Aerator — 200 ft SJTOW cord, 120V (6.7A) or 240V model 3400HAF (3.4A), float, two 50' braided nylon mooring ropes, sacrificial zinc anode, thermal overload protection. Coverage: up to 3/4 acre. Min depth: 17.5". O₂ transfer: 3.0 lbs/HP/hr (Auburn validated). ETL listed. Made in Prescott, WI. 2-year warranty. Bottom screen and C-25/C-85 control panel sold separately.
Comparing to the 4400AF (1 HP, 1 acre) or 2400AF (1/2 HP, 1/2 acre)? Need a decorative fountain instead? Call or text (765) 508-4352 — Monday through Friday, 9 AM to 5 PM EST.
Price Match
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Returns & Refunds
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