Waterfalls and water cannons for pools

The installation requires a dedicated centrifugal pump, separate from the main filtration system, with a flow rate of between 8 and 25 m3/h depending on the model. Connecting these features to the usual return line reduces the water return speed and eliminates the massage effect.

The exact sizing depends on the following technical factors:

• Mouth width: compact water cannons require between 8 and 12 m3/h, while wide waterfalls start at 15 m3/h.
• Suction pipe: 63 mm piping is recommended to prevent cavitation as water is drawn from the pool.
• Motor power: equipment such as the Winner 0.5 HP Single-Phase Pump is suitable for moderate flow rates in standard residential water cannons.

A qualified installer must check the linear pressure losses before setting the final power.

AISI 316 stainless steel is the only alloy recommended for pools with salt chlorinators, thanks to its molybdenum content. AISI 304 steel is susceptible to pitting corrosion and surface staining in environments with sodium chloride concentrations above 2 grams per liter.

In salt-treated installations, the molybdenum in grade 316 forms a dense passive layer that protects the metal against salinity and constant moisture in the pool. In addition to choosing AISI 316, you must connect the accessory’s base to the facility’s equipotential bonding system to divert residual galvanic currents. This precaution ensures that the cannon’s polished surface retains its shine without discoloration for years of intensive use.

The unit is anchored using a metal base with a mounting plate bolted onto a level concrete footing, or with a structural chemical anchor. It must not be installed directly on loose tiles or floating paving without a rigid support.

The installation procedure includes the following steps:

• Structural fastening: drill with a concrete bit and insert stainless steel threaded rods using two-part chemical anchor resin.
• Hydraulic connection: watertight joint with an O-ring and a detachable connection to a 1 1/2- or 2-inch female thread.
• Grounding: screw the ground wire to the inner mounting plate to suppress stray currents.

Secure fastening prevents continuous mechanical vibrations that could crack the perimeter coping when the pump starts.

The jet with an interchangeable nozzle offers superior focused pressure, ideal for intense cervical hydrotherapy, while the waterfall provides a relaxing sheet of water over the shoulders with less concentrated force. The choice depends on whether the therapeutic effect or visual appeal is the priority.

The operational differences between the two options are clear:

• Massage jets: concentrate the flow into dense circular or flat columns, providing deep muscle relief to the trapezius and upper back.
• Laminar waterfalls: distribute the water into a continuous sheet 30 to 50 centimeters wide, softening the sound of the impact and gently enveloping the body.

For users seeking a powerful hydromassage effect, the targeted jet is the recommended option.

The flow is adjusted using a ball valve installed on the discharge pipe inside the equipment enclosure. This shutoff valve allows the water inlet to be throttled or opened until the exact pressure desired by the user is achieved.

Do not regulate the flow by throttling the pump’s suction, as this can cause cavitation and turbine overheating. Alternatively, variable frequency drives on recirculation pumps let you adjust the rotation speed using a program, tailoring the hydrotherapy jet’s force while consuming less electricity. With a properly sized manual PVC pressure ball valve, the jet can be calibrated reliably in just a few seconds.

Leave a clear passage at least 90 centimeters wide between the cannon body and any fence or perimeter wall. This distance helps prevent accidental trips on the coping stone when the area is wet.

Adjacent access points must also be made stable with sturdy supports, such as the FX-02 Pool Ladder Handrail with Flat Bar, to provide slip-free access to the deep end. Installing the cannon so its outlet is 25 or 30 centimeters above the water surface ensures the jet enters the pool without splashing the surrounding deck. This arrangement helps maintain comfort around the pool edge.

Preventive maintenance requires regularly cleaning the metal surface with fresh water and a non-abrasive, neutral cleaner to remove limescale and chlorine deposits. Never use metal scouring pads or hydrochloric acid-based products.

In areas with very hard water or active salt chlorination, applying stainless steel passivation paste every three months restores the protective chromium oxide layer. Maintaining the water pH between 7.2 and 7.6 prevents premature chemical attack on the metal. During winterization, it is advisable to drain the supply pipe by opening the equipment housing’s drain valve to prevent frost damage to the anchor elbow.