Pool drains

Pool drains draw in the colder, denser water that collects at the bottom of the pool and direct it to the recirculation pump. This process prevents thermal stratification and the settling of heavy particles that surface skimmers cannot capture.

Routing this flow to equipment such as the Winner 0.5 HP Single-Phase Pump distributes the disinfectant evenly throughout the water column, ensuring uniform chemical treatment and complete drainage when the system needs to be emptied.

You must install a drain specifically designed for liners, fitted with a clamping flange, elastomeric watertight seals, and stainless steel screws. Bodies designed for traditional concrete pools lack this pressure frame, which would cause immediate leaks behind the flexible liner.

The technical difference lies in the perimeter seal:

• Liner models: feature a double watertight seal and a bolted flange that presses the liner against the ABS body.
• Concrete models: feature a rough surface for direct anchoring in mortar without additional mechanical joints.

Check that the screw spacing matches the existing holes before finalizing the replacement.

The connection diameter should be sized according to the hourly filtration flow rate and the recommended speed in the suction lines. The typical configuration has a 2-inch side outlet for bonding 63 mm PVC pipe, or a 1 1/2-inch threaded bottom outlet for 50 mm pipe.

If the hydraulic system operates at flow rates between 11 and 15 m³/h, a 2-inch connection reduces suction head loss. This pipe connects to circuit components such as the 6-way 1½" selector valve (SP0710X62E), so matching the pipe size prevents cavitation and excessive mechanical stress on the motor.

Modern models feature anti-vortex grates designed to keep the water flow rate below 0.5 m/s. This deflector geometry distributes the suction force around the perimeter and horizontally rather than directly downward.

To maximize preventive safety, we recommend:

• Install anti-vortex grates with openings smaller than 8 mm to prevent fingers from getting through.
• Connect two main drains at least two meters apart if the flow rate exceeds 15 m³/h.
• Keep the stainless steel fixing screws tightened at all times to prevent the cover from shifting accidentally.

With this arrangement, if an object partially covers the surface, peripheral suction dissipates the vacuum and eliminates the suction-cup effect.

The main drain grate should be inspected regularly to remove heavy sediment, settled leaves, or limescale deposits that block its suction openings. Excessive debris buildup reduces flow to the filter system, increases the vacuum in the suction line, and strains the pump.

Check the condition of the plastic components annually; if you find structural cracks caused by sunlight or chemical wear, replace the protective cover immediately. For minor leaks around buried perimeter joints, technical products such as AQUA-STOP leak sealant, 1 L. PM-660. Piscimar. can seal hairline cracks without draining the pool.

For a 32-square-meter pool, installing at least two interconnected main drains is recommended to distribute hydraulic suction. These two drains ensure that suction flow is distributed evenly, halving the flow velocity at each grate.

The two drains must be at least two meters apart and positioned at the deepest point of the pool. Connecting both outlets to a common manifold leading to the equipment room ensures even drainage of the deep water and compliance with standard safety recommendations against excessive localized suction.

Yes, the main drain is positioned at the lowest point of the pool specifically to allow all the water to be removed by gravity or forced suction. When the water level drops below the skimmers, they must be closed at the filter system’s valve manifold so the pump does not draw in air and operates exclusively with the flow from the main drain.

Keep the drain valve open to the main drain and make sure debris does not build up in the pre-filter during the final drainage phase. This allows the water to be renewed or the pool to be prepared for deep cleaning without using external drainage pumps.