March to May: the pre-summer service window
The eight or so weeks before June are the most valuable in the pool year. The water is warm enough to work comfortably but not yet hot enough to punish mistakes, and every serious technician in the country knows that whatever is marginal in April will fail in July. This is when the annual equipment audit belongs: pump seals and O-rings checked for perishing, the pressure gauge on the filter verified against a known-clean baseline, timer settings reviewed, and the skimmer weirs and baskets inspected for cracks.
It is also the season for sand filter media changes. Filter sand in the UAE degrades faster than manufacturers' generic three-to-five-year guidance suggests, because the dust load and near-constant filtration grind the grains smooth and channel the bed. If the sand has not been changed in three years, or backwashing no longer brings the pressure back down, book the change now rather than discovering the problem during an August algae fight. Many owners switch to glass media at this point, which resists channelling and typically lasts longer.