Most green pools in Dubai can be recovered in 3–7 days without draining. The process is shock chlorination, aggressive brushing, continuous filtration with frequent backwashing, then vacuuming out the dead algae and rebalancing. Draining is the right call only in specific cases — we’ll cover exactly which.
Why your pool turned green
A green pool has one root cause: sanitiser failure. Chlorine dropped low enough, for long enough, that algae established. In Dubai the usual triggers are:
- A missed service week (or two) in summer heat
- Stabiliser (cyanuric acid) creep — years of chlorine tablets push stabiliser so high it locks up the chlorine, which stops working even at “good” readings
- A failed pump or timer quietly cutting circulation
- High pH making the chlorine present ineffective
That last group matters: pools can turn green while someone is still adding chlorine. If your pool went green under a maintenance contract, the chemistry wasn’t being tested properly — dosing without testing is guessing.
The recovery process, step by step
- Assess and test everything. Chlorine, pH, alkalinity, and critically stabiliser. This decides chemical recovery vs partial drain.
- Correct pH first (target ~7.2). Shock added at high pH is money poured into ineffective water.
- Shock chlorinate at algae-killing levels — a multiple of normal dosing, not a scoop more.
- Brush every surface hard. Algae anchors to walls, steps and corners; unbrushed algae survives shock behind its own biofilm.
- Run filtration continuously for days, backwashing whenever pressure rises. The filter is doing the visible clearing.
- Vacuum dead algae out — to waste where the system allows, so it leaves the pool entirely instead of loading the filter.
- Rebalance and verify before anyone swims: clear water, correct readings, visible main drain.
Light green usually clears in 2–3 days; a dark green “pond” takes closer to a week of staged visits.
When draining is genuinely the answer
- Stabiliser is extremely high — no realistic amount of chlorine will work; diluting the water is the only fix
- Long-term neglect — months green, heavy debris, possible staining that needs surface attention
- TDS is extreme after years without water replacement
Even then, a partial drain (a third to a half, refilled and treated) is often enough — and far kinder to your pool shell and your water bill than a full drain. Full drains in Dubai heat also carry real structural risk if done carelessly, especially with high groundwater; they should never be the default recommendation.
If a company’s first answer to a green pool is “drain it,” get a second opinion. It’s often the profitable answer, not the right one.
Keeping it from happening again
Recovery buys you a clean slate; only routine protects it. Weekly testing and dosing, stabiliser tracked over time, and a service that proves each visit happened. That’s the whole game.
Pool already green? Send us a photo on WhatsApp — we’ll tell you honestly whether it’s a 3-day recovery or a partial drain, and quote both.