Pool pumps

To choose a pool pump, you need to know the water volume and calculate the flow rate required for proper recirculation.

You must also take into account the total dynamic head, the length and diameter of the pipes, the number of elbows and valves, the equipment location, and the installation's head losses.

The pump must also operate within the flow rate range permitted by the filter.

The pump flow rate must be sufficient to circulate the pool's volume of water properly within the planned recirculation time.

However, the maximum flow rate stated in a pump's specifications is not necessarily what you will achieve in your installation.

The actual flow rate decreases as the head losses caused by pipes, filters, valves, accessories, and differences in height increase.

The total dynamic head represents the resistance the pump must overcome to circulate water through the installation.

It does not depend solely on the physical height difference between the pool and the pump. The pipes, elbows, valves, filter, and other hydraulic components also play a role.

For this reason, when comparing pumps, it is advisable to consult their performance curve rather than just the advertised maximum flow rate.

The pump power should not be chosen in isolation.

Two pumps with similar power ratings may provide different flow rates depending on their design and the installation's resistance.

To make the right choice, compare primarily the available flow rate at the expected total dynamic head, as well as the power and electricity consumption.

Not necessarily. An excessively powerful pump may circulate more water than the filter or pipes can properly handle.

This can increase pressure, electricity consumption, and filtration speed without improving water quality.

The right pump is one that provides the required flow rate under the installation's actual hydraulic conditions.

The pool pump and filter must be sized together.

The actual flow rate delivered by the pump must be within the operating range permitted by the filter.

Before combining both pieces of equipment, check the flow rate, operating pressure, connections, and the manufacturers' recommendations.

A self-priming pool pump is designed to facilitate priming and operate in certain installations where the pump may be located above the water level.

Its suction capacity is limited by the installation conditions and the specifications of each model.

The suction pipe must be airtight to prevent air from entering and hindering operation.

A variable-speed pump allows the motor speed to be adjusted and the flow rate to be adapted to different pool requirements.

It can operate at reduced speeds during regular filtration and increase performance when the installation requires a higher flow rate.

Under certain conditions, operating for longer at a lower speed can reduce electricity consumption and noise levels compared with continuously using a conventional pump at maximum speed.

A conventional pump normally operates at a fixed speed, whereas a variable-speed pump allows the operating speed to be adjusted.

Variable speed offers greater adaptability to different operations and can improve energy efficiency when the installation is correctly sized.

The choice will depend on pool usage, hydraulic characteristics, operating hours, and budget.

A pump that does not suction properly may have air in the circuit, insufficient priming, insufficient water level, an empty prefilter, closed valves, or blockages in the suction line.

Air may also be entering through the prefilter lid, seals, or connections.

It is advisable to check these points first before assuming that the pump has an internal fault.

Air in the prefilter may be related to leaks in the suction area, deteriorated seals, poorly sealed connections, or insufficient water level.

It is also advisable to check the skimmer, valves, and prefilter lid.

Continuous air intake can reduce the flow rate and affect system operation.

An abnormal increase in noise may be related to vibrations, cavitation, air in the circuit, worn bearings, dirt or an incorrect hydraulic installation.

It is also advisable to check that the pump is properly supported and that no pipes are transmitting vibrations to the structure.

If the noise appears suddenly, it is advisable to identify its source before keeping the equipment running for prolonged periods.

Cavitation can occur when suction conditions do not allow the pump to receive water properly.

It can cause noise, vibrations, performance loss and damage if it continues for prolonged periods.

Possible causes include suction restrictions, undersized pipes, blockages or unsuitable hydraulic conditions.

A pool pump should not run dry unless the manufacturer expressly states that the equipment is designed to do so.

Water contributes to the proper operation and cooling of certain components, especially the mechanical seal.

Running a conventional pump without water can cause damage and should be avoided.

A leak may occur at the prefilter lid, seals, fittings, hydraulic connections, drain plugs or mechanical seal.

Locating the leak helps identify the component that needs adjustment or replacement.

Not all leaks require replacing the entire pump, as many models have specific replacement parts.

Before replacing a pool pump, it is advisable to check whether the fault can be resolved through maintenance or with a compatible replacement part.

Replacement may be appropriate when there is significant damage, persistent performance loss, repeated breakdowns or when the pump is incorrectly sized for the installation.

When choosing the new pump, do not use only the old model's power as a reference: also check the flow rate and hydraulic conditions.

Periodically check the prefilter, lid, seals, connections and any possible leaks.

Keep the prefilter basket clean and prevent the pump from running without water or with a blocked suction line.

It is also advisable to monitor changes in noise, vibrations or flow rate and follow the manufacturer's maintenance and winterization instructions.