Filtration replacement parts and purification systems

To choose compatible filtration and pump replacement parts, locate the manufacturer’s specification plate on the filter body or pump. Check the filter’s outside diameter in millimeters, the nominal flow rate in m³/h, and the water connection size, usually 1½" or 2". For example, to replace a compact filter head, the Star 300 sand filter with top-mounted valve requires replacement parts with specific threads and pitches for its 300 mm tank.

Checking O-ring tolerances and thread pitch helps prevent water leaks and loss of prime in the suction circuit.

Sand being discharged into the pool through the return jets indicates that one or more lower laterals are broken, or that there is a crack in the central collector pipe. These slotted plastic parts retain the filter media while allowing clean water to flow back into the pool. If a slot gives way due to age or excessive pressure, silica grains escape directly into the return pipes.

To fix this problem, empty the sand from the filter, unscrew the damaged laterals, and install genuine replacements with the same thread pitch. This is also a good time to inspect the top diffuser and the filter clamp gasket.

The selector valve gasket should be replaced when you notice continuous dripping from the drain pipe while filtering or an abnormal drop in pressure at the return jets. This part, known as a spider gasket or seal, deteriorates with chlorine cycles and when the handle is operated while the pump is running.

• Check for visible leaks underneath the selector handle.
• Check for dirty water accidentally entering the pool while backwashing the filter.
• Install compatible models such as the 6-way 1½" selector valve (SP0710X62E) to ensure a watertight seal.

A constant loss of flow accompanied by bubbles in the pre-filter is usually caused by air entering through the pump lid or wear on the shaft’s mechanical seal. Before replacing the entire motor, check the O-ring on the clear lid and the leaf basket.

If water leaks from the bottom of the pump housing where it joins the electric motor, the part that needs replacing is the mechanical seal. Keeping these components in good condition prevents the motor from running dry or suffering heat-related failures due to excessive strain in compact units.

The pressure gauge is faulty if it shows a reading above 0 bar when the pump is off, or if the needle stays still when switching between the filtration and backwash settings. A working pressure gauge should read 0 bar at rest and rise to a normal operating pressure of 0.6 to 1.2 bar during normal operation.

Replacing this 1/4" threaded component makes it possible to tell when the sand bed is saturated with dirt and needs immediate cleaning, preventing excess pressure that could crack the filter tank.

When renewing the suction line of an above-ground pool, it is essential to replace the skimmer mouth assembly, the double butterfly gasket, and the non-return flap to prevent loss of prime. For above-ground steel-wall pools, using a standardized kit such as the Skimmer + return jet AR100 ensures an exact fit with the wall cutouts and 32 mm or 38 mm flexible connections.

• Replace the lip seal to prevent water leaks toward the outer casing.
• Check that the inner basket fits snugly to protect the motor impeller.
• Replace the return jet to direct the return flow correctly.

Genuine filtration and pump replacement parts ensure precise dimensions, resistance to chemical degradation, and a watertight fit without excessive Teflon tape or force-fitted adapters. A genuine component for brands such as Hayward, Gre, or Starpool ensures that the design pressure ratings remain unchanged.

Using genuine spare parts minimizes unplanned downtime in summer and protects costly components such as the pump or tank from load imbalances in the system.