Not everyone in India has the same hard water problem. A flat in Bandra drawing from Mumbai's Tansa reservoir system has very different water from an apartment in Gurgaon on borewell supply. Understanding what TDS means in practice for your glass helps you set the right maintenance expectations.
300 mg/L TDS --- Light Mineral Presence
At 300 mg/L, water contains moderate levels of dissolved calcium and magnesium. This is within the BIS acceptable limit of 500 mg/L for drinking water, and considered 'fair' quality for consumption. For bathroom surfaces, it means gradual mineral accumulation rather than rapid scale buildup.
At this level, you'll notice a slight haze on glass after 2--3 weeks without cleaning. Chrome fittings develop faint water spots after individual droplets dry. A monthly clean with an acid-based product keeps surfaces consistently clear. Regular soap-and-water cleaning will not keep up — it can remove soap scum but not the mineral layer.
500 mg/L TDS --- The Threshold
500 mg/L is where the BIS draws the line for acceptable drinking water, and it's also the threshold where bathroom maintenance becomes noticeably harder. At this level, visible scale on glass begins appearing within 10--14 days of a thorough clean.
Water spots on chrome after each use are visible to the naked eye. Glass shower enclosures develop a milky haze that scatters light and makes the glass look permanently dirty even when freshly wiped. Mineral crust begins forming around tap bases, showerheads, and tile grout within weeks. A bi-monthly acid clean — every 2--3 weeks — is the minimum effective maintenance frequency.
700 mg/L TDS --- Severe Hardness
At 700 mg/L, you're dealing with water classified as 'very hard.' This is common in much of Rajasthan, Haryana, and parts of Delhi NCR, particularly areas relying on borewell supply. Scale is aggressive and fast.
Glass begins showing visible white deposits within 5--7 days of cleaning. After a month without acid treatment, scale layers can build up to the point where they noticeably roughen the glass surface and make it harder to wipe down. Showerhead nozzles begin clogging within months. Chrome and brass fittings show permanent pitting if scale is left untreated repeatedly — the acid from scale mineralisation slowly attacks the metal surface underneath.
At 700 mg/L, weekly maintenance with an acid-based product is the standard recommendation. This isn't excessive — it's proportionate to the mineral load your water deposits.
900 mg/L and Above --- Extreme Conditions
Above 900 mg/L, the scale problem extends well beyond aesthetics. Geyser heating elements, washing machine drums, and dishwashers accumulate scale rapidly enough that appliance lifespan is meaningfully reduced. Pipes in new buildings can show measurable scale buildup within a year.
On shower glass at this level, a 2-week-old uncleaned surface can have scale thick enough to feel rough under your fingers. Removal at this stage requires sustained acid contact and some mechanical scrubbing. Restoration of glass that has been left untreated for months may require multiple treatment sessions.
If your tap water tests above 900 mg/L, the standard advice is to install a whole-house water softener — an ion exchange system that replaces calcium and magnesium ions with sodium ions. This is a significant investment (₹15,000--₹50,000 installed) but pays back in appliance longevity and dramatically reduced cleaning effort.
How to Test Your TDS
A digital TDS meter costs ₹300--₹500 on Amazon or at local appliance stores. Fill a glass from your bathroom tap (not through an RO purifier if you have one — you want the raw water reading), dip in the probe, and wait for the reading to stabilise. That number tells you where you stand and what maintenance schedule makes sense.
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