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Filter Pumps
Pool filter pumps are the heart of any reliable water treatment system
The filter pump keeps the pool water clean and maintains stable water quality through continuous circulation. It draws water in through skimmers or floor drains. Larger impurities are trapped in the skimmer basket and pump pre-filter. The filter pump then circulates the water through the filter, where finer particles are removed by the filter media. Pool chemicals or alternative water treatment solutions are optimally distributed throughout the water circulation system.
For pool builders, the most critical factors in selecting a filter pump are proper sizing, hydraulic balancing and energy efficiency.
What Pool Builders Should Consider When Making a Decision
When choosing the right filter pump, the following points should be a priority:
- sufficient flow rate for the specific pool
- a well-matched combination of pump and filter tank
- energy-efficient operation
- materials suitable for the desired water quality
- easy maintenance and high operational reliability
The perfect filter pump for every pool project
Whether it’s a private in-ground pool, above-ground pool, or commercial facility: The filter pump must always match the pool’s size, the filtration system, and the planned circulation capacity. A pump that is too small will not achieve the required circulation, while a pump that is too large will cause unnecessary operating costs and can strain the system. Therefore, the pump should always be selected based on pool volume, pipe resistance & counter pressures, and filter type.
Proper Pump Sizing
Calculation of the nominal flow rate for a private pool according to ÖNORM EN 16713-2
The nominal flow rate is calculated as follows:
Q = V / t
Q = flow rate in m³/h
V = pool volume in m³
t = desired circulation time in hours
For private pools, a circulation time of approximately 4 - 6 hours is generally recommended.
Sample Calculation
Pool size: 8 × 4 × 1.5 m
V = 8 × 4 × 1.5 = 48 m³
With a circulation time of 4 hours, this results in:
Q = 48 / 4 = 12 m³/h
The filter system should therefore be capable of delivering at least 12 m³/h given the existing system resistance.
Important Considerations When Selecting a Pump
In addition to the required flow rate, the total head of the system must also be taken into account. This is determined by all pressure and friction losses in the system, such as those caused by:
- Piping and fittings
- Elevation differences
- Filter resistance
- Heat pumps or solar systems
The pump should be selected so that its performance curve lies above the system’s actual operating point. The basis for this is the pump's head-flow diagram.
Note: For speed-controlled pumps, the desired flow rate is set directly. However, the pump's performance limits must still be taken into account during sizing, just as with conventional filter pumps.
Energy-efficient and cost-effective to operate
Power consumption plays a particularly important role in professional applications. Modern filter pumps with inverter technology and intelligent speed control adjust their output to actual demand, helping to reduce operating costs. This makes them especially attractive to pool builders who want to offer their customers a cost-effective and future-proof solution.
Reliability and Durability
A high-quality filter pump must operate reliably under continuous use. Durable materials, long-lasting seals, and solid construction are therefore key indicators of quality. For pools with saltwater systems, only models that are saltwater-resistant and corrosion-resistant should be used.
Low-maintenance solutions for professionals
In day-to-day operations, it's not just performance that counts - ease of maintenance matters too. Easily accessible pre-filters, simple cleaning procedures, and a sturdy design simplify maintenance and reduce downtime. This is especially important for pool builders who want to ensure their systems operate reliably over the long term.
Summary
The right filter pump ensures clean water, low operating costs, and a long-lasting pool system. When planning a pool professionally, you should therefore focus not only on price, but above all on technology, efficiency, and optimal integration with the entire system.
Recommendations
Choosing a location
When planning, make sure to select a frost-proof, well-ventilated location that is easily accessible for maintenance work.
Pump running time
The running time of the filter pump depends on factors such as temperature, debris intake, and sunlight exposure. As a general guideline, a sufficiently powerful pump should run for about 8 hours a day, ideally spread out over the course of the day so that the water does not stand still for too long.
Modbus RTU
Filter pumps with Modbus RTU enable intelligent control and easy integration into modern pool and smart home systems such as iQnnect, KNX, or Loxone.
Depending on the system, features such as precise speed and operating mode control, real-time monitoring of operating data and error messages, as well as control via app, web interface, or building management systems are possible.
Noise Reduction
Pumps mounted on solid surfaces can increase noise levels. Anti-vibration feet or pads help reduce disruptive noise.
Material requirements for saltwater pools
Filter pumps for saltwater pools must be approved for use with saltwater. Durable materials, robust seals, and water-carrying components specifically designed for saltwater or seawater are essential to prevent corrosion, material damage, and premature wear.
Selection Guide
Recommended pump models suited to the size of a private skimmer pool.
| Pool dimensions |
Water volume m³ |
Flow&rate m³/h at 10 m |
Model |
|---|---|---|---|
| 8 x 4 m | < 48 | 12 | Inver iQ300 Vario 150 Series O50 E.Pro 150 Europro 50 |
| 8 x 4 to 10 x 5 m | 48 < V ≤ 75 | 12 - 19 | Inver iQ300 Vario 150 Series O100 E.Pro 150 Europro 100 |
| 10 x 5 to 12 x 5 m | 75 < V ≤ 90 | 19 - 23 | Inver iQ300 Vario 150 Series O150 E.Pro 150 Europro 150 |
| 11 x 6 to 12 x 6 m | 75 < V ≤ 108 | 23 - 27 | Inver iQ300 Series O200 E.Pro 300 Europro 200 |
The Ocean Inver iQ 300 self-priming filter pump is equipped with inverter technology, is infinitely variable, and can be operated at variable speeds. It is very quiet in operation and consumes up to 82% less energy than conventional on/off pumps.
Comparison Table Filter Pump Characteristics
 |
|
 |
 |
 |
 |
|
|---|---|---|---|---|---|---|
| Ocean Inver iQ300 |
Ocean Vario iQ150 |
Ocean Series O |
Smart E.Pro |
Smart Europro |
Smart Series M |
|
| Max. flow rate at 10 m (m³/h) | < 30 | < 21 | < 29 | < 37 | < 40 | < 13 |
| P1 (kW) | 2.53 | 1.1 | 0.53 - 2.54 | 1.25 - 2.25 | 0.90 - 2.80 | 0.29 - 1.06 |
| P2 rated power (HP) | 3 | 1.74 | 0.5 - 3 | 1.5 - 2.6 | 0.5 - 3 | 0.25 - 0.95 |
| I max (A) | 10.5 | 10.5 | 1.7 - 12.2 | 5.6 - 10 | 3.5 - 12 | 1.26 - 4.6 |
| Suitable for salt electrolysis | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Single-phase | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| 3-phase | ✔ | ✔ | ✔ | |||
| Ready to plug in versions | ✔ | ✔ | ✔ | ✔ | ✔ | |
| Variable speed | ✔ | ✔ | ✔ | |||
| Volume flow control | ✔ | |||||
| Programmable relays | ✔ | ✔ | ✔ | |||
| Digital inputs | ✔ | ✔ | ✔ | |||
| MODBUS-RTU interface | ✔ | ✔ | ||||
| Alarm | ✔ | ✔ | ✔ | |||
| Frost protection function | ✔ | ✔ | ✔ | |||
| Energy meter | ✔ | ✔ | ||||
| Drainage | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| Energ efficiency class | IE4 | IE4 | IE3 | IE4 | IE3 | IE3 |
| Protection class | IP55 | IP55 | IP55 | IPX5 | IP55 | IP55 |
| Art.-Nr. | View product | View product | View product | View product | View product | View product |
Self-priming Filter Pumps
Self-priming filter pumps can vent themselves and draw in water even when the pump is installed above the water level. To do this, simply fill the pre-filter with water before starting the pump. The pump then creates a vacuum and builds up the water column on its own.
In contrast, standard suction pumps must be installed below the water level, as they cannot vent themselves. Running dry can quickly lead to damage to the mechanical seal.
Advantages of self-priming pumps
- Flexible installation above or below the water level
- Automatic venting of the suction line
- Reliable operation even with small air pockets
- Usually includes an integrated pre-filter to protect the pump
Important to know
Pool pumps without a pre-filter are generally not self-priming. However, the presence of a pre-filter alone does not automatically mean that the pump can be operated above the water level—the decisive factor is explicit labeling as "self-priming".
Recommendation
Self-priming filter pumps are particularly suitable for pools with a technical room at pool level or above the water level and offer maximum flexibility in terms of location.
Advantages of Filter Pumps with Inverter Technology
Filter pumps with inverter technology or variable speed control automatically adjust their output to actual demand. Unlike conventional pumps, they do not run continuously at full load and are therefore significantly more efficient.
Your advantages at a glance
- Up to 80% lower power consumption
- Significantly quieter and lower-vibration operation
- Improved filtration performance due to lower flow velocity
- Less wear and longer service life
- Flexible power adjustment, e.g., for backwashing or water attractions
- Lower operating costs and quick payback
Especially in pool systems with fluctuating load requirements, speed-controlled pumps ensure particularly economical and convenient operation.
Demand-Based Control
In modern Smart Pools, demand-based control is a central principle. It ensures that the pool does not operate according to fixed, inefficient schedules, but rather reacts flexibly and dynamically to current conditions.