Buying Guide for Water Purifiers in India

Full form of TDS, ppm, RO, UV, UF in Water Purifier

On this page we will explain the meanings of some of the most common abbreviations used with water purifier, like TDS, pH, ppm and what does RO+UV+UF means in water purifiers

What is water TDS, water TDS full form, TDS meaning in water

The full form of TDS is 'Total Dissolved Solids'. The meaning of TDS in water is that it is a measure of how much dissolved solids or chemicals there is in water. TDS is a technical term used to give a measure of the amount of dissolved matter in the water. The definition for TDS is the weight of total dissolved solids in one million parts of the weight of the water containing the salts. TDS is usually expressed as 'ppm' which stands for 'parts per million' or as 'milligrams per liter' (mg/L). Expression of TDS as 'milligrams per liter' (mg/L) is a very, very close approximation, since 1 Liter of water with dissolved solids will not strictly be exactly equal to 1Kg. 1 Kg per liter is the weight of distilled water without any dissolved salts.

TDS is very important in selecting an RO water purifier. This is because the pressure required by an RO water purifier to push water through a RO membrane depends on the TDS of water. The higher the TDS of water, the more pressure is required for water to flow through the RO membrane. Normal domestic RO water purifiers cannot handle more than about 1000 ppm TDS in the raw water.

To give an example of how water TDS is calculated: Assume there is 1 Kg of water and this one kilogram of water contains dissolved salts, say 100 mg of Sodium Chloride, 50 mg of Calcium bi Carbonate, 25 mg of Magnesium Chloride and 25 mg of Calcium Chloride. The total weight of all the salts together weighs 200 mg (100+50+25+25). The weight of water is 1Kg which is equal to 1000 grams which is the same as a million milligrams. So the 1 Kg of water contains 200mg of salts. By the definition of TDS, the TDS of this water is 200 ppm or 200 mg/L

The TDS of water and the electrical conductivity of water has an almost linear relationship. So, for convenience, usually the Electrical Conductivity - EC of the water is measured and the Electrical Conductivity expressed in micro-siemens per centimeter (at 25 °C) is used as a measure of TDS in water. It can also be converted to ppm or mg/L by using a multiplication factor (0.55 to 0.8 depending on the concentration of dissolved solids) to give an approximation of the TDS in water. This measurement of TDS can be done quickly in the field using pocket TDS meters.

The World Health Organization or WHO and most of the governments around the world has set an upper limit for the TDS - Total Dissolved Solids of non-toxic salts in water to 500 ppm (parts per million) or 500 milligrams per liter of water. Most of our Public supplied water is safe with regards to TDS, but it is a good idea to check.

Some of the effects of dissolved chemicals in water are to make the water acidic or basic and this is measured by the 'pH' of water. Another common effect of water TDS water hardness. TDS in water purifier selection is an importan criteria.

What is ppm in water purifier

PPM in water purifer stands for 'parts per million' and is a measure of how much of a substance there is in the water. It is used with TDS which is expressed in ppm. TDS PPM value of the raw water is an important criteria in the selection of water purifier.

What does RO+UV+UF means in water purifiers

The term RO=UV+UF in water purifiers means that it is a water purifier having three types of water purification process included in the one water purifier. Since fulll form of RO is Reverse Osmosis, full form of UV is Ultra Violet and the full form of UF is Ultrafiltration, a water purifier with RO+UV+UF will have Reverse Osmosis + Ultra Violet + UltraFiltration processes built in.

Other common abbreviations used with water purifier

ANSI – American National Standards Institute
CBPs - Chlorination Disinfection by-products
CTO – Chlorine, Taste, Odor
DBPs - Disinfection by-products
EPA – Environmental Protection Agency
GAC – Granular Activated Carbon
GPD – Gallons per Day
HAA - Haloacetic Acids LPD - Liters per Day
MCL – Maximum Contaminant Level
NF - Nanofiltration
NTU - Nephelometric Turbidity Unit
NSF – National Sanitary Foundation of USA
PAC - Powdered Activated Carbon
ppb - Parts per billion
TFC – Thin Film Composite
THMs – Trihalomethanes
TSS - Total suspended solids VOC – Volatile Organic Compounds
WHO - World Health Organisation
WQA – Water Quality Association of USA

Best way to buy Water Purifiers in India

The best way to buy Water Purifiers in India is to first look at all models of Water Purifiers available online at the leading online Retailers in India. For example on the online webpage of All Water Purifiers available in India on Amazon.in, you will find the full range of Indian Water Purifiers complete with their best discounted price and full specifications. This is great information, and you can decide on which model of water purifier to buy. With the model of water purifier you want to buy finalised, you can go to local shops to try and find the model of water purifier you have chosen and see if you can get at similar price of that at Amazon.in. In most cases the price from Amazon will be cheaper, because they buy in bulk from the manufacturers direct and they sell huge volumes because they are the world's largest and most trusted online retailer. If you buy from Amazon, they will arrange to have the water purifier installed in your house, usually free of charge.

Warranty and other facilities offered through Amazon are usually better than what you can get from local agents of water purifiers.

All pages in our website www.AchaWater.com

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