- Identify the leak in an above-ground or in-ground pool using the dye test. Release dark food coloring slowly from a syringe into the pool so it is pulled toward the leak and drawn out. Mark the location with a grease marker so you can repair it according to whether the pool is plastic or concrete. Also inspect the fittings, filter and pump of an in-ground pool for moisture that indicates these components have a leak and tighten with hose clamps. Leaks in the underground plumbing, however, need professional help.
- Drain water from the pool. Extend the crack in the in-ground concrete pool 1/2-inch deep and 1/2-inch longer on each side using a grinder. Caulk the crack until 1/4 inch below the top edges and leave to dry. Prepare pool patching plaster according to manual instructions and apply into the remaining part of the crack with a utility knife. Extend the plaster outside the crack to cover the area 1/2 inch all around. Leave the crack to dry before adding water.
- To repair a leak in an inflatable pool, cut out a section of pool liner slightly larger in size than the tear. Glue the edges of the cutout and place it over the tear until the glue dries.
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