Difference Between 5 Stage And 6 Stage Reverse Osmosis System

RO purifier eliminates pollutants when pressure forces unfiltered water over a semipermeable membrane. To create clean drinking water, water flows from the RO membrane's more concentrated side (with more toxins) to the less concentrated side (with fewer pollutants). The fresh water we get from here is called permeate. The concentrated water residue is called brine.

Basically small pores in a semipermeable membrane keep impurities out while allowing ions to flow through. As water travels through the membrane in osmosis, it becomes more concentrated, attaining equality on both sides. Reverse osmosis prohibits pollutants from entering the membrane's less concentrated side. When reverse osmosis is applied to a volume of saltwater, for instance, the salt is removed and only pure water comes through.

Benefits of RO system

But still RO is used immensely everywhere because of the benefits which are-

Protection against bacteria

Living in an era of polluted water where getting affected by a deadly disease is very likely, it’s good luck to have pure drinking water. In this case RO purifier diminishes the risk of exposure to such diseases as it filters out 99% of the bacteria from the water.

Protection against chlorine

If you have your water from municipal water supplies, then it surely has chlorine because chlorine makes the water easier for humans to consume. Even though chlorine kills off some bacterias but it does have some risks of its own. RO removes chlorine from this water.

Protection against virus and parasites

As per the above point, chlorine does destroy some viruses and bacterias but still it doesnt fight against the bacterias one gets from tap water. So the solution is- RO purifier, yet again.

Provides a better flavour

Tap water goes through a lot of pipes and stays in the underground tanks for long enough to pick up on unpleasant taste and odour along the way. RO water purifies the water enough and removes the awful scent and provides better tasting water.

Customising based on needs

Some of the RO water purifiers come with a TDS controller. So one can change the TDS control of their filter based on the TDS level of their water and have the amount of TDS they need. And also one can just buy a water purifier with a mineral cartridge which will add minerals in the water.

Read also: Reverse Osmosis Technology

Stages of RO system

A reverse osmosis system revolves around the RO membrane, but it also includes other types of filtration. A sediment filter and a carbon filter, in addition to the RO membrane, are included in every reverse osmosis water system. Depending on whether water travels through them before or after passing through the membrane, the filters are termed as pre filters or postfilters.

Basically every RO purifier contains one or more of these filters:

  • Sediment filter:

Lessens dirt, dust and rust etc particles.

  • Carbon filter:

Reduces the amount of VOCs, chlorine, and other pollutants in water that give it a foul taste or odour.

  • Semi permeable membrane:

Eliminates around 98% of TDS.

What is 5 stage reverse osmosis

The three types of filters offered are pre-filters, RO Membranes, and Post-filters. Three high-efficiency SED and carbon pre-filters make up the pre-filter stage, and their major objective is to protect the RO membrane while also filtering out big molecule water contaminants.

The stages that we see in this system are:

  • Sediment pre filter which basically gets rid of small particles like dirt, dust etc.
  • Carbon pre filter. Pesticides, herbicides, chlorine, and other chemical contaminants found in water are dealt with at this step. lead, aluminium, oils and various other contaminants are also removed by this filter.
  • Reverse osmosis membrane. The main task happens in this stage. It does fine filtration.
  • Post carbon filter. It gets rid of foul taste and smell.

What is 6 stage reverse osmosis

There is also 6 stage reverse osmosis and many people don't know about it. The stages one sees in this filtration system are-

  • Stage 1A 5 Micron Sediment Filter which is made of 100% polypropylene fibres and it basically eliminates dirt, dust etc small particles.
  • Stage 2A Granular Activated Carbon Filter Composed of High - Performance Activated Carbon. Destroys Free Chlorine, Odour, Organic Contaminants, Pesticides and Chemicals.
  • Stage 3A Carbon Block Filter Composed of High Performance Carbon. Eliminates Trihalomethanes, Pesticides and Volatile Organic Chemicals (VOCs).
  • Stage 4A High Rejection Thin Film Composite Reverse Osmosis Membrane

Dissolved Salts, Lead, Copper, Barium, Bacterial By-Products, Oestrogen, and Silica are among the contaminants that can be removed from water by the membrane.

  • Stage 5A Post Carbon Filter Designed to Improve Taste. Removes any remaining impurities and odors from the container and improves the purified water's quality.
  • Stage 6 Remineralizing filter. Calcium, Magnesium, Potassium, and Sodium are used to enrich the water ions with beneficial minerals.

Difference between 5 stage and 6 stage Reverse Osmosis System

In the 5 stage RO system, the filter cartridge, also known as a PP cotton filter cartridge (PPF), is the first phase, followed by the granular activated carbon (UDF) filter cartridge, the precision compressed activated carbon (CTO) filter cartridge, and finally the reverse osmosis membrane or ultrafiltration. The post activated carbon water filter cartridge is the fifth stage after the filter membrane.

The weakly alkaline energy bar was introduced to the six-stage RO System water filter technology (PPF filter + granular activated carbon + sintered activated carbon + ultrafiltration membrane + back activated carbon + weakly alkaline energy bar). The water filter is not only suited for locations where tap water pollution is severe, but it can also filter residual chlorine in typical tap water and enhance water flavor.

But 5 stage water RO is recommended everywhere cause of the sustainability. And also the 6 stage is said to be over purified.

Which one is recommended?

Even though there are many types of RO such as 5,6 and even 7 stages of filtration. For the majority of these cases, at least 5 stages are recommended. A re-mineraliser is included in our 6 stage system, which improves water with calcium and magnesium.

In the end, RO is a very popular system and one should choose based on their circumstances and their preference.

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