Gre

Choosing a Gre liner depends exclusively on the geometric shape, perimeter diameter, and height of the steel wall. Gre manufactures standardized pools with three main wall heights: 90 cm, 120 cm, and 132 cm.

When selecting the PVC liner, check the exact measurements of your frame to prevent deformation:

• Round shape: models with diameters of Ø 240 cm, Ø 350 cm, Ø 460 cm, or Ø 550 cm.
• Oval shape: lengths of 500x300 cm, 610x375 cm, 730x375 cm up to 915x470 cm.
• Attachment system: overlap suspension or hooked profile, depending on the top edge.

For example, if you have a standard circular frame with a diameter of 3.5 meters, the correct part is the Gre blue liner Ø 350x120 for round pools, designed with UV-resistant treatment to withstand continuous water pressure.

To fix leaks around the cutout in a Gre pool’s steel wall, the watertight gasket and the complete surface skimmer assembly must be replaced. The usual cause is deterioration of the plastic frame or drying out of the perimeter seal due to chlorine products and solar radiation.

The recommended technical installation requires fitting the AR100 skimmer + return inlet, which includes the floating weir, the strainer basket, and a double watertight gasket die-cut to fit the brand’s pools. This part fits snugly over the galvanized steel wall without straining the metal, preventing rust around the cut edges and restoring direct flow to the filtration system.

For above-ground pools with wall heights between 120 cm and 132 cm, a symmetrical A-frame ladder or one with removable steps is required, specifically designed to avoid placing direct weight on the top rail.

The Gre Ladder for Above-Ground Pools, model AR11680 features a tubular galvanized steel frame with an anti-corrosion coating and non-slip polypropylene steps. This model includes a removable front section that allows the outer steps to be removed when the pool is not in use, preventing unsupervised children from accessing it, in accordance with the European Union’s domestic safety guidelines.

Gre’s solar collector raises the water temperature by harnessing solar radiation and the power of the filtration pump itself, without using additional electricity. The system passes the filtered water through a series of high-density black polyethylene channels that absorb the sun’s thermal energy before returning the flow to the inlet nozzle.

The Gre AR2069 Solar Heater for Above-Ground Pools can raise the pool water temperature by between 3 °C and 6 °C, depending on direct sunlight and the total water volume. For maximum performance, it is connected in bypass after the sand filter, and a thermal cover must also be used at night to prevent the heat accumulated during the day from escaping.

The technical difference lies in the factory cutting pattern, the distribution of high-frequency thermal welds, and the points of mechanical stress along the sides. A circular liner is subject to constant radial hydrostatic pressure, while oval pools require a construction that can withstand the support provided by the buttresses and buried tie rods along the straight sections.

Analyzing the two formats reveals specific construction requirements:

• Round models feature uniform concentric perimeter seams, allowing symmetrical installation without folds where the floor meets the wall.
• Oval models: feature reinforced areas to fit the U-shaped support profiles or side wedges, preventing strain on the curved corners.

Installing an incompatible liner creates air pockets, excessive tension in the seams, and possible premature tears.

The owner can replace a 460 cm Gre liner by following the manufacturer's instructions, without needing complex plumbing tools. The process requires completely emptying the structure, removing the upper retaining caps and profiles, and first disconnecting the skimmer frame and return inlet.

To ensure wrinkle-free installation, unroll the liner at a temperature above 20 °C so the PVC becomes sufficiently flexible. After aligning the seam with the perimeter of the base, add about two centimeters of water and smooth the floor manually with bare feet, working from the center toward the walls. Only cut out the skimmer openings when the water level is just below the metal cutout.

Winter maintenance of a Gre steel pool requires treating the water with a chemical pool winterizer, lowering the water level below the skimmer, and fitting an opaque protective cover that prevents photosynthesis and protects the steel wall from frost.

Three technical steps must be taken before temperatures drop:

• Lower the water level to about 10 cm below the return inlet to prevent the pipes from cracking due to freezing.
• Drain the residual water contained in the skimmer body and empty the sand filter tank.
• Tighten a winter cover secured with a cable and metal perimeter tensioner to prevent organic debris from entering the pool.

The pool should not be completely emptied in winter, as the body of water is essential for stabilizing the steel wall against strong winds.