Anyone with a brush and a rope can call himself a tank cleaner in Karachi, and many do. The difference between a proper job and a bad one is not visible from the lid, which is why it pays to ask a few direct questions before you hire a tank cleaning company in Karachi. A serious provider will answer all of them without hesitation.
We are a tank cleaning company, so read this with that in mind. We have tried to make every point checkable by you, using public sources, and it applies to us as much as to anyone else.
The nine questions, at a glance
| Ask | A good answer | Red flag |
|---|---|---|
| Is tank cleaning your main business? | Yes, with a fixed office and landline or branch numbers | A side service alongside painting, fumigation or general labour |
| What equipment do you bring? | Pressure washer, wet vacuum, pump, lighting, safety kit | Brush, bucket and rope |
| How do you enter an underground tank? | Ventilation, gas check, harness and a person at the hatch | “The boy just goes down” |
| Which disinfectant do you use? | Named product, safe for drinking water tanks, rinsed afterwards | “Acid”, “chemical”, or cannot say |
| How is the price worked out? | By tank type and size, in writing, before work starts | A vague figure that grows on the day |
| Do I get a report? | Dated report with photographs | Nothing in writing |
| Are you registered for tax? | SRB and FBR registration you can verify, numbered invoice | Cash only, no invoice |
| What certificates do you hold? | Current certificates from a recognised body, shown on request | A logo on a flyer and nothing else |
| Who else have you worked for? | Named clients, reviews on a profile you can read | “Everyone knows us” |
1. Is tank cleaning their main business?
A company that cleans tanks every day has the equipment, a routine and trained staff. A general contractor who takes the occasional tank job usually has none of the three and hires day labour for the work. Ask how long they have been doing it, where their office is, and whether the people who arrive will be their own employees.
2. What equipment will they bring?
Three items do most of the work. A pressure washer strips the slippery bacterial film off walls and ceilings. A wet vacuum lifts the sludge out of the tank; without one, sludge is stirred up and most of it stays. A pump controls drainage so dirty water goes to a drain and not across your courtyard. If the answer is a brush and detergent, the result will be a tank that looks cleaner and is not. We explain why in tank wallah versus professional cleaning.
3. How do they enter an underground tank safely?
This question can save a life. Closed tanks collect gases and lose oxygen. In June 2025, five men died in an underground water tank in Ibrahim Hyderi: a worker and the owner’s son collapsed inside, and three more died trying to pull them out. In 2022, four workers died the same way at a factory in Landhi.
The precautions are well established. The WHO’s technical note on cleaning storage tanks says to blow fresh air into the tank and to keep someone outside at all times. Sindh’s own factory law forbids entry into any tank or confined space where dangerous fumes are likely unless it has been made safe or the person has breathing apparatus and a rope held from outside (Sindh Factories Act, 2015, section 48). Ask what the crew does before anyone goes down. If the answer is nothing, do not let them work on your property.
4. Which disinfectant do they use?
They should be able to name it, tell you why it is suitable for a drinking water tank, and explain how it is rinsed out. The accepted options are chlorine-based products at a controlled dose and silver-stabilised hydrogen peroxide. Be wary of anyone who uses hydrochloric or other industrial acid to brighten concrete, pours in raw household bleach by eye, or carries unlabelled bottles. Our article on silver hydrogen peroxide for tank disinfection explains what we use and how it compares with chlorine.
5. How is the price worked out?
A fair price depends on whether the tank is underground or overhead, its capacity, the material, and for large sites the access. A provider who quotes without asking any of this is guessing, and the usual result is an argument at the end. Ask for the figure in writing and ask what it includes: drainage, sludge removal, disinfection and the report. Be suspicious of prices far below the market as well. Equipment, trained staff and safety gear cost money.
For comparison, our online calculator gives a fixed price for standard homes from the property type, tank location and size, and the quote is the final price. Commercial and industrial sites get a free survey first.
6. Do they leave a written report?
A dated report with photographs taken inside the tank before and after is your only proof of what was done. It also tells you the condition of the walls, lid and fittings, and gives you a date to work from for the next cleaning. Landlords, unions, schools and restaurants need it for their own records. If nothing is offered in writing, there is nothing to hold the provider to.
7. Are they registered for tax?
Registration with the Sindh Revenue Board (SRB) and the Federal Board of Revenue (FBR) tells you the business exists on paper, can be traced, and can issue a proper invoice. You can check both yourself in a couple of minutes: the SRB runs an online taxpayer search, and FBR’s Active Taxpayer List can be checked online or by SMS to 9966. For companies and institutions this matters for another reason, because paying an unregistered service provider has tax consequences for the payer. We cover that in why SRB and FBR registration matters.
8. What certificates do they hold, and can you verify them?
ISO 9001 covers quality management and ISO 45001 covers occupational health and safety. Neither is a licence to clean tanks, but both mean an outside auditor has checked that the company follows a documented system. Certificates expire, and fake ones exist, so ask to see the certificate itself and check the issuing body. ISO explains how to verify an accredited certification, and the IAF CertSearch database lists certificates issued by accredited bodies. What the two standards mean in practice is covered in our certifications explained and why ISO-certified tank cleaning matters.
9. Who else have they worked for?
Look for named clients and for reviews on a platform the company does not control. Read the recent ones, look at how complaints were answered, and be cautious about a profile with only a handful of glowing lines. Our own clients are listed on the clients page, and this article explains how to read and check our reviews.
Two more things worth asking
How quickly can they come, and at what hours?
Supply turns in Karachi come at odd hours, and a tank is easiest to clean when it is nearly empty. A provider who can work around your supply day, including evenings and Sundays, saves you wasted water.
Do they know your kind of tank?
Underground RCC, rooftop plastic, fibreglass and stainless steel tanks are cleaned differently. Pressure that suits concrete will damage fibreglass. Ask whether they have cleaned tanks like yours, and for large buildings ask how they handle multiple tanks without cutting off the whole block.
When you hire a tank cleaning company in Karachi: the day itself
- Confirm the price and scope before work starts.
- Watch the safety setup for the underground tank. No ventilation and no one at the hatch means stop.
- Ask to see the sludge that came out, and look at the floor before disinfection.
- Check the walls near the waterline with a torch. They should not feel slippery.
- Make sure the tank is rinsed until the water runs clear.
- Collect the report and the invoice before the crew leaves.
A step-by-step account of a visit is in what happens during a professional tank cleaning.
How Khan Tank Cleaning answers these questions
- Main business: tank cleaning only, since 2005, from offices in DHA Phase 2 and Gulshan-e-Iqbal.
- Equipment: 3,000+ PSI jet washing and vacuum sludge extraction, as set out in our cleaning procedure.
- Underground entry: forced ventilation and a gas check before entry, harness and tripod, and an attendant at the hatch.
- Disinfectant: silver-stabilised hydrogen peroxide, with food-grade chlorine for heavily contaminated tanks. No industrial acids and no raw household bleach.
- Price: written before work starts; the quote is the final price.
- Report: dated service report with photographs and a recommended next-service date.
- Tax: SRB and FBR registered, with a numbered tax invoice.
- Certificates: ISO 9001 and ISO 45001. Ask either branch to show you the current certificates.
Check any of it before you book. The thinking behind these standards is set out in how we built a trusted tank cleaning service. Our branches cover DHA, Clifton and South Karachi and Gulshan, Jauhar and East Karachi.
Frequently asked questions
How much should tank cleaning cost in Karachi?
It varies with tank type and size, so no single figure is honest. Get a written quote based on your actual tank, and compare what is included, not only the number.
Is the cheapest option ever the right one?
For a rinse, perhaps. For removal of sludge and biofilm with safe entry and proper disinfection, a price that cannot cover equipment and trained staff usually means those things are missing.
Do I need to be at home during the cleaning?
Someone should be, at least at the start and the end, to agree the scope, see the tank before refilling and receive the report.
How often will I need to hire someone?
Every four to six months for most houses. The detail is in how often to clean a water tank in Karachi.
Should I ask for references?
For a house, public reviews and a look at a sample report are usually enough. For a building, school or business, ask for two clients of a similar kind and call them.
What if the crew that arrives is not what was promised?
Do not let work start. Call the office, and if the equipment or safety arrangements described on the phone are missing, send the crew away. You are under no obligation once the terms have changed.
Sources
External references used in this article, checked in October 2026:
- Dawn, 11 June 2025: Five dead after inhaling toxic gases in water tank in Karachi
- Dawn, 4 January 2022: Four workers die after inhaling toxic fumes in factory’s water tank
- WHO Technical Note No. 3: Cleaning and disinfecting water storage tanks and tankers
- The Sindh Factories Act, 2015
- Sindh Revenue Board: online taxpayer search
- ProPakistani: How to verify FBR active taxpayer status
- ISO: How to verify an accredited certification
- IAF CertSearch: global database of accredited certifications
About Khan Tank Cleaning
Khan Tank Cleaning has cleaned residential, commercial and industrial water tanks in Karachi since 2005. The company was founded by Mateen Khan, who still oversees quality control at both branches. More about us, or get in touch: 0333 0293174 for DHA and South Karachi, 0340 2717530 for Gulshan and East Karachi, both answered 24 hours.
Mateen Khan is the Founder & Owner of Khan Tank Cleaning, Karachi’s first dedicated professional water tank cleaning company (est. 2005). With 20+ years of industry experience, he leads an ISO 9001 & ISO 45001 certified team that follows a strict 8-step process using industrial equipment and food-grade disinfectants. Mateen is committed to making clean, safe water accessible to every household and business in Karachi.