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Summer · April – June
India's April–June heat pushes stored water temperature above 25°C. That is prime range for bacterial and algae growth on the tank walls. By late May, most uncleaned tanks in Delhi, Mumbai and Ahmedabad show a visible green ring near the water surface — that is algae, not just sediment.
Cleaning the tank in April kills two birds: you enter summer with a fresh tank, and you get 4–5 months of clean water before the monsoon inflow (which itself brings its own dirt from open collection).
Costs depend on tank capacity, tank material (Sintex is easier than concrete), and access. High-rise rooftop tanks in metros run higher than ground-floor Sintex.
| Tank type | Capacity | Cost 2026 (₹) |
|---|---|---|
| Overhead Sintex tank | 500 – 1,000 L | 800 – 1,500 |
| Overhead Sintex tank | 1,000 – 2,000 L | 1,200 – 2,000 |
| Concrete underground sump | 2,000 – 5,000 L | 1,800 – 3,000 |
| Large society tank | 5,000+ L | Quoted per site |
| Motor + tank combined service | — | 1,500 – 3,500 |
Ask the cleaner to send you a video of the inside of the tank before and after. A shortcut cleaning is very easy to spot — walls still have a slime layer or brown scale — and unfortunately, it is the norm on commission-based apps that pay the worker a fixed fee.
Once every 6 months is the safe rule for most Indian homes; once every 12 months is the minimum. Homes on borewell water need it every 4–6 months because sediment settles faster. Homes on municipal supply can stretch to 12 months if the tank is UV-protected and sealed.
Do not wait for the yearly cleaning date if you notice any of these signs. A single unattended month can turn a clean tank into an infection risk.
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Between ₹800 and ₹3,000 depending on tank size and material. A 1,000-litre Sintex overhead tank is usually ₹1,200–₹2,000, an underground concrete sump is ₹1,800–₹3,000.
Every 6 months for most Indian homes. Every 4–6 months for borewell water, every 12 months minimum for sealed municipal supply. Do not stretch beyond 12 months.
A 1,000-litre overhead tank takes 60–90 minutes end-to-end. A large concrete sump takes 2–3 hours. Book a morning slot so the tank refills through the day.
Food-grade chlorine (bleach) at a dilution recommended by the cleaner, used for 15–20 minutes then rinsed twice. Avoid petroleum-based cleaners and strong acids — they damage the tank lining and leave residue.
Someone should be there for the first 10 minutes to unlock rooftop access and the last 10 minutes to verify the tank is clean and the outlet is closed. Between that, the cleaner works independently.
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