Wet Season Pool Care in Bali: How to Keep Your Pool Clear from November to March

Ask any pool technician in Bali when the emergency calls come in, and the answer is the same: the wet season. From roughly November to March, rain, humidity and storms put every villa pool under pressure — and pools that sailed through the dry season suddenly turn green in a weekend. None of it is bad luck. Here is exactly what the rain does to your water, and the routine that beats it.

What heavy rain actually does to a pool

• Dilutes your chemicals. A serious downpour adds a surprising volume of fresh water, instantly dropping chlorine and stabiliser levels.
• Crashes the pH. Rain is naturally slightly acidic, and storm rain pulls pH and alkalinity down — unbalanced water where chlorine works poorly.
• Washes food in. Leaves, blossom, soil and garden runoff carry organic matter and phosphates straight into the water. That is algae food, delivered.
• Overflows and backwash. An overflowing pool loses treated water and takes in debris at the same time.

Combine those with 30-degree water and you have the perfect algae incubator. That is why the wet season is green-pool season.

The wet-season adjustments that matter

• Increase pump run time. Whatever your dry-season hours are, the wet season needs more. Circulation and filtration are your first defence against a bloom.
• Test more often — and always after a storm. A big overnight downpour means the water you balanced yesterday is not balanced today. Test, correct pH first, then restore chlorine.
• Keep debris moving out. Skim daily if you can, and empty skimmer and pump baskets frequently. Debris left to sink and rot feeds algae and stains surfaces.
• Watch the water level. After heavy rain, drain excess down to the correct level so the skimmer keeps working properly.
• Mind the garden. Trim overhanging trees before the season and check drainage so garden runoff does not sheet into the pool during storms.

The mistake almost every owner makes

Cutting back care because “nobody is swimming.” The wet season is when many owners are away and villas sit quiet — and it is precisely when the pool needs the most attention. An unwatched pool in January is the classic setup for the February rescue call. If the villa will be empty, the pool still needs its twice-weekly service; algae does not check the booking calendar.

Storm aftermath: the 24-hour rule

After any major storm, the first 24 hours decide whether you stay clear or go green: get debris out, run the pump hard, rebalance the chemistry. Pools that get that same-day attention almost never bloom; pools left “until the weekend” often do.

What this looks like with professional care

A good maintenance service does not treat January like July. Through the wet season we run longer filtration schedules, dose for dilution, and get to pools after storms — and every visit is confirmed with a written report to your WhatsApp, so you know the pool is handled even when you are on the other side of the world. See what year-round care costs in our pricing guide, or start with our new owner’s guide.

Get ahead of this wet season

Message us on WhatsApp to set up wet-season pool care → Fixed monthly pricing, chemicals included, written report after every visit.