Seasonal Pool Maintenance: A Practical Guide

Summer is peak pool season. Higher temperatures, more swimming, longer UV exposure, and more organic matter entering the water all increase maintenance demands.

Water chemistry

• Test more frequently — 2–3 times per week minimum, or after heavy use
• Chlorine depletes faster — UV and bather load consume chlorine quickly. Evening dosing helps.
• Check stabiliser — if levels are low, chlorine burns off faster. If levels are too high (above 50 ppm), chlorine becomes less effective.
• pH tends to drift — test and adjust as needed. High pH in summer reduces chlorine efficacy.

Filtration

• Run the pump longer — 8–10 hours daily in peak summer (vs 6–8 in cooler months)
• Clean the filter more often — higher debris load means faster clogging
• Check the skimmer baskets — empty them regularly, especially during pollen season or after storms

Physical care

• Skim daily — leaves, insects, and debris accumulate quickly in summer
• Brush the walls — weekly brushing prevents algae establishing, especially in shaded areas
• Check the water level — evaporation is significant in hot, dry conditions. Top up as needed.

Autumn is a transitional season. Pool use drops, temperatures cool, and leaf fall increases.

Water chemistry

• Reduce testing frequency — weekly is usually sufficient
• Adjust chlorine dosing — lower demand means less chlorine needed. Over-dosing wastes chemicals.
• Check stabiliser levels — if you've been adding stabiliser through summer, levels may be elevated

Filtration

• Reduce pump run time — 6–8 hours daily is typically sufficient
• Backwash or clean the filter — end-of-season clean is a good practice
• Inspect the pump and plumbing — check for leaks, loose connections, or unusual noise before winter

Physical care

• Leaf management — invest in a good cover or net if trees surround the pool
• Clean the pool surround — clear debris from the paving and drainage areas
• Consider a pool cover — as use decreases, a cover reduces evaporation and chemical loss

Winter is the quietest season for most pools. In warmer parts of Australia (QLD, northern NSW), pools may still be used regularly. In cooler regions, many pools are covered or minimally maintained.

If the pool is in use year-round

• Test weekly — chemistry still needs monitoring even with lower temperatures
• Reduce chlorine dosing — cooler water requires less chlorine, but do not stop entirely
• Run the pump 4–6 hours daily — sufficient for circulation and filtration
• Heat if needed — if you have a heat pump or solar system, winter is when it earns its keep

If the pool is closed for winter

• Balance the water — correct pH, alkalinity, and calcium before covering
• Super-chlorinate — add a high dose of chlorine to prevent algae growth under the cover
• Cover securely — a well-fitted cover prevents debris, reduces evaporation, and blocks UV
• Check periodically — peek under the cover every 3–4 weeks. Top up chlorine if needed.
• Do not drain — keeping water in the pool protects the surface (concrete pools can crack if drained in dry conditions; fibreglass can float if the water table rises)

Spring is preparation time. Get the pool ready for the season ahead.

Opening checklist (after winter cover)

• Remove the cover carefully — drain any standing water off the cover before removing it
• Test the water immediately — expect to adjust chemistry after months under cover
• Shock the pool — a chlorine shock helps clear any algae or organic buildup
• Run the pump continuously for 24–48 hours after opening
• Clean the filter — backwash (sand/DE) or clean (cartridge) after the initial clearing
• Inspect equipment — check pump seals, chlorinator cell (if salt), heating system, and plumbing
• Check fencing and gate — verify self-closing and self-latching function before the season starts

Pre-season preparation

• Service the heat pump (if applicable) — clean the heat exchanger, check refrigerant
• Inspect the pool surface — look for cracks, staining, or tile/grout issues
• Check chemical supply — stock up on chlorine, pH adjusters, test strips, and DE/sand if needed

Regardless of season, some practices are constant:

• Never stop circulation entirely — even in winter, the water needs to circulate to prevent stagnation
• Maintain minimum chlorine levels — even at low use, water without sanitiser will turn
• Keep the filter maintained — a dirty filter does not clean water regardless of chemistry
• Address problems early — small issues (minor algae, slight cloudiness) are cheap to fix. Large problems (black algae, equipment failure) are not.
• Keep records — a simple log of test readings, chemical additions, and maintenance actions helps spot patterns and troubleshoot problems