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Salt chlorinators for swimming pools

A salt chlorinator produces disinfectant in the pipework instead of asking you to add it by hand. Pool water is lightly salted, and as it passes through an electrolytic cell the system converts the dissolved salt into free chlorine, which then reverts to salt after it has done its work. The result is a pool that is dosed continuously while the filtration pump runs, with no drums of liquid chlorine to store and far less handling of concentrated chemicals. Here we list complete systems, control units and modular treatment kits from Hayward, Pentair, Fluidra and Norsup, across outputs from a few grams per hour up to large commercial units.

How salt electrolysis works in practice

The installation has two parts: a cell plumbed into the return line after the filter and heater, and a power supply or control box mounted on the wall. The control box feeds low-voltage direct current to the electrode plates inside the cell and reverses the polarity at intervals so that limescale does not build up on them. Output is set as a percentage of capacity and runs only while there is flow, which is why every system includes some form of flow or gas detection to prevent the cell from firing in a dry pipe.

Chlorine production depends on the salt concentration, the water temperature and the cleanliness of the electrodes. Always use the salt level stated by the manufacturer of your unit, keep the water balanced and check pH regularly, because a high pH reduces the effectiveness of the chlorine the cell is making. Several ranges handle this automatically: the Norsup water treatment kit of modular type NorsupOne combines pH correction with electrolysis in one assembly, and the Pentair Soleo Connect Rx control system adds measurement and regulation to the salt circuit.

Matching output to pool volume

Salt chlorinators are rated two ways, and both appear in the product names here. Grams per hour describes how much chlorine the cell can generate; cubic metres describes the pool volume the manufacturer considers suitable. The two are linked, so a Soleo Connect at 13 g/h is quoted for 75 m³ and the 27 g/h version for 150 m³. When choosing, consider:

• Vízmennyiség — the real figure including any overflow tank, not the nominal size on the pool brochure.
• Bather load and exposure — a sunny, heavily used pool consumes far more chlorine than a covered one.
• Daily filtration hours — a cell only produces while the pump runs, so short cycles need more capacity.
• Existing control — whether you want a standalone unit or a system with pH and redox regulation built in.

Sizing slightly above the calculated need is usually wiser than sizing exactly, because a cell running at a lower percentage lasts longer than one permanently at full output.

Ranges and models listed here

The Hayward side of the range is broad. AquaRite HC LS NG all-in units cover 60, 120 and 150 m³, and the AquaRite+ SV LS appears in a 60 m³ standard version. The Aquascenic line offers HD1 at 15 g/h and HD2 at 30 g/h, while Bionet comes as BIO16, BIO22 and BIO33 at 16, 22 and 33 g/h. Uvscenic models UV16 and UV33 pair electrolysis with a UV stage in the same housing. For larger installations the Oxilife series is listed at 350 and 500 g/h.

Pentair is represented by the Soleo Connect family, including the Rx control system, and Fluidra by the GenSalt OT retail box units such as the OT 10 R at 10 g/h. Note the output figure and the series name together when ordering, as cells, lids and unions are specific to each line.

Cells, electrodes and what wears out

The electrode is a consumable. Its plates lose coating gradually with every hour of production, so a cell that no longer reaches its rated output has usually reached the end of its service life rather than developed a fault. Before that point, the usual service items are the cell housing seal or O-ring, the union nuts, the flow switch and the sensor cables. Scale on the plates reduces output too and can often be removed by soaking in a dilute acid solution, following the instructions for your model.

When replacing a cell, match the series and the output rating exactly, and check the number of plates and the connector type against the old part. Measuring the pipe diameter at the unions before ordering avoids a second trip to the plant room.

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Here you will find complete salt chlorination systems and control units alongside the modular treatment kits that combine electrolysis with pH dosing, covering domestic pools through to high-output installations.

Keeping a range from several manufacturers side by side makes it easier to compare output, pool volume and level of automation before you commit, and to find the equivalent model when an older unit is no longer available.