RO TDS Check Guide: High TDS, Low Flow & Bad Taste Diagnosis in Ahmedabad (2026)

High TDS, low flow and bad taste are the three symptoms that bring most RO calls in Ahmedabad. They look similar from the outside, but they point to different parts — and the wrong guess costs money. This guide gives you the check order a fair visit follows, what the before and after TDS readings mean, and how to tell a filter problem from a membrane problem. For an RO TDS check in Ahmedabad, the rule is diagnosis first, replacement second.

What TDS Actually Means

TDS is total dissolved solids — the salts dissolved in water, read in parts per million (ppm) by a small handheld TDS meter. Two readings matter: inlet TDS (your tap water going in) and outlet TDS (purified water coming out). The gap between them is the membrane's report card. A healthy membrane brings inlet TDS down sharply. A weak membrane barely moves it.

The Check Order, Step by Step

A diagnosis visit follows a fixed order, because skipping a step hides the real fault:

1. Power. Is the unit actually running? A dead adapter or loose plug mimics every other fault.
2. Inlet pressure. Low pressure starves the membrane and drops flow. A pressure test takes a minute.
3. Pre-filters. Sediment and carbon filters are checked for clogging and visible dirt.
4. Membrane TDS test. Inlet and outlet readings are recorded side by side.
5. Pump. A weak pump cannot push water through the membrane at the right pressure.
6. Storage tank. Tank pressure and valve condition affect flow even when purification is fine.
7. Flow, taste and leaks. The final check confirms the whole chain, not just one part.

Reading the Numbers: Before and After

Ask to see both readings. If inlet TDS is, say, high and outlet TDS is far lower, the membrane is doing its job and the fault lies elsewhere — usually filters or pressure. If outlet TDS is close to inlet TDS, the membrane is weak, because it is no longer reducing salts. If readings swing wildly between visits, the water source itself may have changed — common in Ahmedabad where borewell and municipal supply mix by area and season.

Filter or Membrane? The Decision Rule

Use this rule before agreeing to any replacement:

• Filter problem: flow has slowed, taste is slightly off, or the pre-filter looks visibly dirty — while TDS readings are still healthy. Filter from ₹199+.
• Membrane problem: TDS stays high after a filter change, or taste turns salty or metallic. Membrane is quoted upfront, with no figure guessed here, because it depends on the unit.
• Neither: low flow with normal TDS and clean filters points to pressure, pump or tank — checked in the order above.

Ahmedabad Water: Why Readings Vary by Area

Ahmedabad water is not one water. Borewell-heavy areas carry higher TDS than municipal-supply areas, and the same house can see different readings across seasons. That is why a neighbour's filter schedule is not yours: the visit judges your unit by your readings, not by a fixed calendar. It is also why a TDS check on every service visit is worth asking for — it catches a weakening membrane months before taste turns.

What to Ask the Technician

1. Show me the inlet and outlet TDS readings.
2. Show me the old filter before you replace it.
3. Give me the quote itemised — visit charge, filter, membrane, labour as separate lines.

These three questions separate a diagnosis visit from a parts-selling visit. A fair visit answers all three without hesitation.

What a TDS Check Visit Costs

Visit ₹150, domestic service and repair ₹299, filter from ₹199+, priority visit ₹399, AMC ₹1,999, ₹2,999 or ₹3,999 per year. If you decline work after diagnosis, only the ₹150 visit charge applies. The membrane, if needed, is quoted upfront before any work starts, and the work carries the 30-day service warranty.

Book a TDS Check

Call 63560 23655 or 90162 67231 between 8 AM and 8 PM, Monday to Sunday. For an RO TDS check in Ahmedabad, share the symptom — high TDS, low flow or bad taste — and your area, and the visit is confirmed on the call.