1. Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Blue Diamond ET 80 Linear Diaphragm Air Pump. The ET 80 is designed to enhance water quality in ponds, water gardens, and septic systems by providing consistent aeration. It is engineered for durability and reliable performance in various weather conditions.
2. Safety Information
WARNING: Read all safety instructions before installation and operation. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always disconnect the power supply before performing any maintenance or installation procedures.
- Ensure the pump is installed in a dry, well-ventilated area, protected from direct weather exposure, unless specifically designed for outdoor use. The ET 80 is weatherproof, but proper ventilation is still crucial.
- Do not immerse the pump in water.
- Use only grounded electrical outlets and ensure the power cord is not damaged.
- Keep children and pets away from the pump during operation.
- Do not operate the pump if it is damaged or malfunctioning.
3. Product Overview
The Blue Diamond ET 80 Linear Diaphragm Air Pump is a robust aeration solution. It features an all-aluminum chassis for durability and is approved by UL, TUV, and CE standards. This model is suitable for residential septic tanks up to 500 gallons per day (GPD) or for aerating ponds and water gardens.
Key Features:
- All Aluminum Air Pump Chassis
- UL, TUV and CE approved
- Used by original equipment manufacturers of NSF certified residential sewage treatment systems
- 75 Liter/min Air Flow is Suitable for any 500 gal (GPD) Residential Septic Tank
Product Components:
The ET 80 pump comes with a 1/2" ID bronze fitting for easy connection.

Figure 1: Blue Diamond ET Series Linear Air Pump. This image shows a single unit of the Blue Diamond ET Series Linear Air Pump, highlighting its compact design and robust casing.

Figure 2: Multiple Blue Diamond ET Series Linear Air Pumps. This image displays three Blue Diamond ET Series Linear Air Pumps, illustrating their consistent design across different models.
Model Comparison:

Figure 3: Blue Diamond ET Series Air Pumps Model Specifications. This image presents a table comparing various Blue Diamond ET Series models, detailing their maximum flow in CFM and wattage.
4. Setup
The Blue Diamond ET 80 pump is designed for straightforward installation. Follow these steps for proper setup:
- Unpacking: Carefully remove the pump from its packaging and inspect for any damage.
- Placement: Position the pump on a stable, level surface in a location that allows for adequate ventilation and protection from extreme weather. Although weatherproof, avoiding direct, prolonged exposure to heavy rain or snow is recommended.
- Connections: Connect the air hose from your aeration device (e.g., diffuser, air stone) to the 1/2" ID bronze fitting on the pump. Ensure all connections are secure to prevent air leaks.
- Electrical Connection: Plug the pump into a grounded 120V electrical outlet. Ensure the power cord is routed safely to avoid tripping hazards or damage.
For septic system applications, ensure the pump is connected to the appropriate air intake line as specified by your septic system's design.
5. Operating Instructions
Once properly installed, operating the Blue Diamond ET 80 is simple:
- Power On: Ensure the pump is plugged into a functional, grounded electrical outlet. The pump will begin operating immediately.
- Continuous Operation: The ET 80 is designed for continuous operation to provide consistent aeration.
- Pond Aeration: For ponds and water gardens, the pump adds oxygen to improve water quality, benefiting fish and plants. During freezing temperatures, continuous operation can help prevent ice formation, acting as a de-icer.
- Septic System Aeration: In septic systems, the pump supplies air to promote aerobic bacterial activity, which is crucial for effective wastewater treatment.
Monitor the air output to ensure proper function. If air flow is significantly reduced, refer to the Troubleshooting section.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Blue Diamond ET 80 air pump.
- Cleaning: Periodically clean the exterior of the pump to remove dust and debris. Ensure the air intake vents are clear and unobstructed.
- Diaphragm Replacement: The linear diaphragm is a wear-and-tear component. Over time, it may require replacement. The pump is easily serviceable with replaceable diaphragm kits (sold separately). Refer to the specific instructions provided with the diaphragm kit for detailed replacement procedures.
- Air Filter: Check and clean or replace the air filter regularly to maintain optimal air flow and prevent internal contamination.
- Inspection: Annually inspect the power cord for any signs of damage, fraying, or wear.
Always disconnect power before performing any maintenance.
7. Troubleshooting
If you encounter issues with your Blue Diamond ET 80 air pump, consult the following table for common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Pump not running | No power; Damaged power cord; Internal fault | Check power outlet and connections; Inspect power cord for damage; Contact customer support if internal fault is suspected. |
| Low or no air output | Clogged air filter; Damaged diaphragm; Air hose kinked or blocked; Leaks in air connections | Clean or replace air filter; Replace diaphragm kit; Check and clear air hose; Secure all air connections. |
| Excessive noise or vibration | Loose components; Worn diaphragm; Unstable placement | Check for and tighten any loose screws; Replace diaphragm kit; Ensure pump is on a stable, level surface. |
| Overheating | Blocked ventilation; Continuous operation in extreme heat | Ensure air vents are clear; Relocate pump to a cooler, shaded area if possible. |
If the problem persists after attempting these solutions, please contact customer support.
8. Specifications
Detailed technical specifications for the Blue Diamond ET 80 Linear Diaphragm Air Pump:
| Specification | Value |
|---|---|
| Model Number | ET80 |
| Air Flow Capacity | 75 Liters Per Minute (2.83 CFM) |
| Maximum Pressure | 0.1 Bars |
| Wattage | 75 Watts |
| Voltage | 120 Volts |
| Power Source | Corded Electric |
| Product Dimensions (L x W x H) | 12" x 10" x 11" |
| Item Weight | 14.23 Pounds |
| Material | Aluminum |
| Connector Size | 0.71 inch OD (for 1/2" ID hose) |
| Operation Mode | Automatic |
| Certifications | UL, TUV, CE approved |
9. Warranty Information
The Blue Diamond ET 80 Linear Diaphragm Air Pump is backed by a 2-year manufacturer's warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. For specific terms and conditions, refer to the warranty documentation included with your product or contact Blue Diamond Pumps customer support.
10. Customer Support
For technical assistance, replacement parts, or warranty inquiries, please contact Blue Diamond Pumps customer support. Have your product model number (ET80) and purchase date ready when contacting support.
Contact Information: Please refer to the packaging or the official Blue Diamond Pumps website for the most current contact details.