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Shell structure
- Cracks in walls and floor
- Water loss vs plumbing leaks
- Ground movement, slab adequacy
Only one of these is visible from the sun loungers. A general inspection stops at "does the pump run"; the failures that cost money are below the surface and in the plant room.
Sources: RJUE (Decreto-Lei n.º 555/99); InspectOS pool inspection protocol; Algarve pool-repair field data (Piscinaliner, DreamPools). · InspectOS