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Overhead and underground sump tanks accumulate sediment, algae and biofilm over time, even when the incoming water is clean. HomeCare RO offers scheduled tank cleaning using mechanical scrubbing and food-grade sanitisation, for homes, apartments and commercial buildings.
Overhead and sump tank cleaning and sanitisation
Genuine parts, transparent pricing, and a technician who shows up on schedule.
A professional water tank cleaning service removes sludge, sediment, algae, and biofilm from stored water. It includes draining, manual scrubbing, high-pressure jet washing, wet vacuuming, disinfection, and refilling. Homeowners, apartment associations, and commercial buildings in Kochi use this service for overhead tanks, underground sumps, and larger storage tanks, especially when water quality has changed or the tank has not been maintained. HomeCare RO provides this service for apartment and commercial buildings, with a one-off clean or a recurring annual schedule.
A tank should be inspected sooner if any of these signs appear:
A standard professional cleaning follows an eight-step sequence. Each step removes a different type of contamination, so skipping one step usually leaves behind dirt or chemical residue.
| Step | Typical time | Equipment or chemical |
|---|---|---|
| Inspection and photos | 5 to 10 minutes | Torch, camera, visual check of inlet, outlet, overflow, and lid gasket |
| Drain old water | 10 to 15 minutes | Pump or submersible pump, transfer drum |
| Sludge and sediment removal | 10 to 15 minutes | Scoop and sealed bucket |
| Manual scrubbing | 15 to 25 minutes | Food-grade nylon brushes |
| High-pressure jet wash | 10 to 15 minutes | 100 to 150 PSI industrial jet |
| Wet vacuum residual dirty water | 5 to 10 minutes | Wet/dry industrial vacuum |
| Disinfection | 25 to 30 minutes total | Food-grade sodium hypochlorite, 5 percent stock, 50 to 100 ppm in use, 20 minute contact |
| Refill and final inspection | 10 to 15 minutes | Photos and checklist |
A typical home overhead tank cleaning takes about 90 minutes. During inspection, the technician checks the tank condition, inlet, outlet, overflow, lid gasket, cracks, or chemical staining. Before photos are usually taken. The inlet valve is shut before draining so fresh water does not enter mid-cleaning. If there is no drain valve, a submersible pump is used.
After draining, settled sludge is removed with a scoop and sealed bucket. Walls and corners are manually scrubbed with food-grade nylon brushes. The interior is then washed with a 100 to 150 PSI industrial jet. A wet and dry vacuum removes remaining dirty water. Disinfection uses food-grade sodium hypochlorite, typically a 5 percent stock diluted to 50 to 100 ppm, with a contact time of about 20 minutes. The tank is refilled only after disinfection and final inspection. If sludge removal, jet washing, or disinfection is skipped, the result is closer to a rinse than a cleaning.
A cleaning visit covers the interior of the tank. Structural repairs, crack or leak fixing, lid replacement, valve replacement, external tank cleaning, and pipeline cleaning are usually outside the base scope. For underground sumps, part replacements such as lids, pipes, and valves are also separate. A site visit can identify these items before the quote so the scope is clear.
For most homes, overhead and underground drinking water tanks should be cleaned every 3 to 6 months. At least once a year is the minimum. Kochi’s monsoon and borewell or open well supplies can carry more sediment, so some properties need more frequent attention. Keep the lid closed, check the lid gasket and overflow mesh, and clean inlet filters. If the lid is broken, replace it quickly. Otherwise the tank can get dirty again within about a month. A tank not cleaned for several years will usually need more chemical, longer scrubbing, and possibly a second rinse.
HomeCare RO offers a free water test before any recommendation, with no obligation. The test checks TDS, hardness, and visible contaminants, and the site visit can also check whether an existing RO plant and storage tank are working well together. To schedule a tank inspection, a cleaning visit, or an annual plan, contact HomeCare RO on phone or WhatsApp at +91 97464 88180. HomeCare RO serves Kochi and surrounding areas of Kerala, and the technician arrives on schedule.
The proper procedure is to inspect, drain, remove sludge, scrub, jet wash, vacuum dirty water, disinfect, and refill. A food-grade chlorine solution is used, and the tank is checked before and after cleaning. For a standard home tank, this usually takes around 90 minutes.
A common seven-step service order is inspection, water draining, sludge removal, scrubbing, high-pressure jet cleaning, disinfection, and final rinse with drying. Some teams separate wet vacuuming into an extra step, but the core order remains the same.
Professional tank cleaning usually uses food-grade sodium hypochlorite. It is commonly diluted from a 5 percent stock to 50 to 100 ppm in use, with a contact time of about 20 minutes. The tank is refilled only after the contact time and final inspection.
For most drinking water tanks, there is no proper way to clean without removing water. Some large industrial systems may use circulation-based cleaning methods, but a residential overhead tank or underground sump needs draining to remove settled sludge and disinfect surfaces properly.
