Understanding the impurities in water.

Why do we need to understand the impurities in water?

  1. To make an informed decision on whether or not to buy a water purifier.
  2. If decided to buy which technology to choose.

This blog will tell you about all the major impurities present in water.

#NOTE: In terms of quality of your water there is nothing that can be said for sure. Everything depends on the journey your water has taken to come to your overhead tank. Every locality has different quality of water. Only after the analysis of water quality, you can choose which water purifier to buy.

Parameters that define water quality:


  1. Visible to naked eye impurities.
  • Turbidity
  1. Invisible impurities.
  • TDS
  • Hardness
  • Smell/odor
  • Bacteria and viruses

Let’s define all the terms:

Turbidity is the measure of blurriness of water because of suspended impurities present in water.
Turbidity is measured in NTU (Nephelometric Turbidity Units (NTU)).
What’s important to know here is, potable water should have very low turbidity (low NTU), to be precise below 5 NTU. 

Because no one wants to drink water which has suspended particles in it.

Whichever AquaPhoenix water purification technology you choose, you will get crystal clear water [0 NTU water].

Total dissolved solids, the name itself is quite intuitive.
TDS is the total concentration of dissolved solids in water which are not visible to naked eye.
TDS majorly comprises of inorganic salts which are made up of cations like sodium (Na+), potassium (K+), calcium (Ca2+), magnesium (Mg2+), etc. and anions like sulphates (SO42-), carbonates (CO32-), bicarbonates (HCO3), nitrates (NO3), chlorides (Cl), etc.
TDS also comprises of inorganic salts of heavy metals like Arsenic, molybdenum, mercury, lead, cadmium, copper, zinc, iron, etc. and various organic chemicals as well.

TDS is measured in ppm
ppm —- > Parts per million.

More the ppm value, more the TDS.

Below we have mentioned TDS ranges in ppm against qualitative idea of water in that range


TDS can be easily checked at home using TDS meter. You can buy one here [Link to AquaPhoenix TDS meter]

Hardness refers to the presence of calcium and magnesium carbonates, sulphates and chlorides in the water.
It is measured in ppm.
What we need to understand here is, hardness is a part of TDS. All inorganic salts present in water comprise the TDS of water, while a part consisting of calcium and magnesium carbonates, sulphates and chlorides is known as hardness.
Generally more the TDS more the hardness.

Smell / odor:
Now there can be many reasons for your source water to have a bad smell or odor. Possible reasons can be:

  • Leakage or breakage in the pipe line of your source water causing unwanted stuff around to get in water.
  • Passage of sewage water around your source water.
  • Huge bacteria growth in water.
  • Stagnant source of water.
  • Even the water stored in the overhead tank of your house if not used for a long time can have smell because of bacteria growth.

Bacteria and viruses:

Bacteria and viruses are everywhere. So, it’s no surprise to find them in water too. Few are good for health few are not. But there is no scientific evidence that any bacteria or virus present in water is good for health and should be retained.

Be an intelligent customer: 

The first think to do before purchasing water purifier is to know the quality of your source water. This blog explains all the necessary parameters needed to check to make an informed decision on what to buy.

  • Know what you want/need. 
  • Don’t fall prey to marketing gimmicks.
  • Ask questions. If they are not able to answer your questions you have your ANSWER.

We Phoenix Agencies are working in this industry for past 15 years. We master in water purification systems and are trying to pass on this knowledge to the customer for them to make informed decision on which purifier technology to buy.

Shopping Cart
There are no products in the cart!
Continue Shopping