If the coping tiles around the edge of the pool are loose, they must be repaired before they fall off or break. Use polyurethane adhesive sealant to secure the tiles to the pool shell.
Check for leaks around the skimmer box, edges of the pool shell and water outlet from the pump and filter equipment, as these are the most common areas for problems with leakage to occur.
Over time, leaks will cause damage to any nearby structures. Use a sealant to make any leaky areas fully watertight.