Pausing the contract for summer travel
Owners leave for July and August and suspend maintenance to save a month's fee, then return to a green pool that costs more to recover than the paused visits would have. Heat, evaporation and shamal dust make summer exactly the wrong season for a pool to be unattended.
Judging the pool only by clarity
Sparkling water can still be over-stabilised, under-sanitised or corrosively unbalanced. Clarity lags chemistry by days. Insist on seeing actual readings for free chlorine, pH and, in summer, cyanuric acid, rather than accepting a visual all-clear.
Topping up stabilised chlorine tablets indefinitely
Every trichlor tablet adds cyanuric acid that never evaporates. By late summer the pool can be chemically locked, with fine-looking chlorine readings and dull, unsafe water. Dilution with fresh water is the only exit, which is far easier planned in November than forced in August.