TROUBLESHOOT
Green pool water
Result
It went green because the water stopped moving
High confidence — the answers you gave point clearly at this one cause.
At Thai water temperatures — 30–33 °C for most of the year — a pool that is not circulating starts to go green within 24 to 48 hours: the sun burns the chlorine off faster than algae takes to establish. This is the most straightforward cause there is, and it is almost always fixable without a technician.
What to do
- 1
Switch the pump on and leave it running continuously for 24 hours. Do not put it back on the timer yet.
- 2
Brush the walls and floor thoroughly, especially the corners and under the steps. Algae stuck to a surface is shielded from chlorine until you brush it loose.
- 3
Shock it: about 1 litre of 10% liquid chlorine per 10 m³, or about 150 g of 70% granular chlorine per 10 m³. A 4 × 8 m pool averaging 1.4 m deep is roughly 45 m³ — so about 4.5 litres, or 700 g.
- 4
Add it at dusk. Midday sun destroys roughly half of the chlorine you just added within a few hours.
- 5
Always dissolve granular chlorine in a bucket of water first and pour the solution in. Dropping granules straight onto a liner bleaches it permanently.
- 6
The next day the water usually turns cloudy grey-blue — that is dead algae. Vacuum it out to waste if your multiport valve has a WASTE position, then top the level back up.
- 7
Then settle back to 8–10 hours of filtration a day. That is the number for Thai water temperatures — not the 4–6 hours quoted in temperate-climate manuals.
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