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Choosing a Seko pump depends on the pool volume, the backpressure in the recirculation circuit, and the aggressiveness of the chemical product to be dosed.

For standard private pools of up to 80 m³, compact peristaltic pumps provide an adjustable, low-pressure flow rate that is sufficient to stabilize pH. For larger pools or plant rooms with backpressure above 1.5 bar, it is advisable to choose electromagnetic diaphragm pumps such as the Tekna AKS 603 Standard NHP dosing pump, whose pump head withstands high operating pressures without losing chemical injection accuracy.

Persistent pH imbalance can be corrected by installing a slow, steady-injection peristaltic dosing pump in the return pipe after the filter.

Panel-mountable units allow the chemical injection frequency to be adjusted to neutralize fluctuations without causing over-acidification in the pool. A unit such as the Panel-mountable peristaltic pump, 1.5 l/h flow rate. POOL BASIC injects measured volumes of pH reducer, preventing sudden spikes that wear down the lining or harm swimmers' eyes. Progressive dosing ensures that the reagent mixes evenly with the recirculating flow before entering the pool.

The main difference between Seko Tekna AKS and Tekna AKL dosing pumps lies in their control interfaces and operating adjustment modes.

• Tekna AKS: Operates at a constant flow rate that can be adjusted manually using an analog potentiometer on the front panel, designed for continuous dosing.
• Tekna AKL: Features analog control with a dual-scale dosing percentage and an input for a level sensor, allowing chemical injection to stop if the reagent runs out.

To automate chemical dosing without the need for external control signals, the Tekna AKL 603 dosing pump provides precise control of the chemical inventory in the suction tank.

For demanding installations that require powerful dosing against backpressures of up to 8 bar, the Tekna Evo AKS 800 range is the recommended technical solution.

This electromagnetic unit features a solid PTFE diaphragm that provides complete chemical resistance to corrosion caused by concentrated sodium hypochlorite. The Tekna Evo AKS 800 dosing pump handles high flow rates with a configurable operating range, maintaining volumetric accuracy even when the return circuit operates under fluctuating pressure caused by the gradual buildup of dirt in the sand filter.

Preventive maintenance of a Seko dosing pump involves replacing mechanical consumables and chemically descaling its hydraulic lines.

• Santoprene tube: On peristaltic models, it should be replaced once per season to prevent fatigue-related ruptures from compression.
• Injection check valve: Requires cleaning every six months by immersing the component in a diluted acid solution to remove limescale deposits.
• Head with manual bleed valve: On electromagnetic pumps, it is essential to operate the bleed valve to expel gas pockets generated by sodium hypochlorite after periods of inactivity.

Following this procedure at the start of the season ensures quiet, leak-free operation in the equipment room.

Diaphragm electromagnetic pumps withstand continuous intensive use and high hydraulic pressures better, while peristaltic pumps stand out for their ease of maintenance at low pressures.

The peristaltic pump moves liquid using rollers that press on a flexible tube, which prevents mechanical blockages caused by suspended particles but limits its chemical injection pressure to around 1.5 bar. By contrast, Seko electromagnetic models use a sealed head with a solid PTFE diaphragm actuated by a solenoid, offering resistance to back pressures of up to 8 bar and extended mechanical durability without friction wear.

Chemical reagent injection is always installed on the final section of the return pipe, just after the filter and heater, if present.

To install it, the rigid PVC pipe is drilled and a saddle clamp is screwed on to hold the injection check valve supplied with the Seko equipment. The chemical injection point must be connected downstream of any sensitive equipment to prevent concentrated chlorine or pH reducer from damaging the internal components of boilers or chlorination cells. Initial priming is completed by operating the head's manual bleed valve.