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TDS vs. Hardness in Water — What’s the Difference?

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TDS (Total Dissolved Solids)

Measures the total amount of dissolved substances in water—like minerals, salts, and some organic matter—usually expressed in ppm (parts per million).

Commonly measured with a TDS meter or derived from EC (electrical conductivity).

But TDS doesn’t indicate what specific minerals are present, and crucially, it doesn’t reflect the presence of hardness-causing minerals.

Hardness (as CaCO₃)

Indicates the concentration of calcium and magnesium ions in water—also shown in ppm or mg/L.

These minerals are responsible for scale build-up, soap scum, and household appliance damage.

Hard water can hurt appliances, reduce soap efficiency, and leave residue on dishes.

Why the Distinction Matters

A TDS meter might give you a general idea of total mineral content, but it’s not accurate for measuring hardness.

Water softeners specifically target calcium and magnesium (hardness) — they don’t necessarily reduce overall dissolved solids.

Checking only TDS can mislead consumers: A softener might leave you with low hardness but unchanged or even higher TDS, leading to confusion.

Wavoo Hard Water Softener: Your Solution for Genuine Softness

Here’s how the Wavoo Hard Water Softener stands out:

Why It Matters

Reduces Ca²⁺ & Mg²⁺ (Hardness Ions): It targets scale-causing minerals so you enjoy soft water, reduces limescale, and protects your appliances.

Doesn’t Reduce TDS: Because it doesn’t demineralize water entirely, TDS stays steady—so don’t rely on TDS readings to judge performance.

Built for Domestic Use: Compact, user-friendly, and effective for households dealing with hard water issues.

Clear Communication: Emphasize “Reduces Hardness, Not TDS” on your Amazon page to avoid confusion.

How to Test for Hardness (Not TDS)

Instead of measuring TDS, consider:

  • Hardness Test Strips: Quick, easy, and inexpensive for household use.
  • Drop Test Kits: More accurate—ideal for placing before and after softener.
  • Professional Lab Meters: Accurate but typically for lab or industrial users.

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