What is the difference between reverse osmosis and a flow filter? These two systems include cartridges, and at the outlet produce water that can be safely drunk and used in the home. It would seem that the question is solved: you need to choose a cheaper option. But there’s a nuance here. The quality of water in the areas of one city can be very heterogeneous, and what will bring a new well and it is impossible to guess. In spite of the fact that flow filters give out pure liquid, in the conditions of high concentration of impurities they can save. But this does not make the reverse osmosis system an absolute leader. In our article we will consider in detail both variants with their pros and cons. You may also find this article useful: Is NYC Tap Water Safe to Drink?
How the reverse osmosis filter works
Osmosis is based on the ability of water to equalize the concentration of impurities separated by the membrane in the liquid. Due to the microscopic pore size, only water molecules are allowed to pass. An increase in impurities in one part of the system will cause water to flow into the system until the density of the liquid in both areas is equalized. Reverse osmosis works in the opposite direction. The membrane does not equalize the density of the liquid, but collects purified water in one container and impurities solution in the other. For this reason, the filter is called reverse osmosis.
Of course, ordinary consumers have little interest in such details, especially if they have a poor understanding of chemistry. Simply put, the pore sizes in the membrane do not allow particles that exceed water molecules to pass through them, i.e. most of the impurities contained. However, liquid molecules are larger, for example, chlorine molecules, respectively, the device is powerless in the fight against them. In addition, the membrane pores quickly become clogged and the filter itself stops functioning when in contact with large impurities.
To avoid such troubles, the reverse osmosis system design includes additional elements that pre-treat water for final treatment. The partially treated liquid is separated into two parts by a reverse osmosis membrane. Approximately one-third is treated with water that is fed into the storage tank and suitable for use. The remaining 2/3 is a liquid with impurities, which is discharged into the sewage system. The tank and tap are separated by a special container with a cartridge that improves the quality of treated water, for example, by saturation with useful chemical elements.
Before we talk about the difference between reverse osmosis and a flow filter, we will understand the principle of the reverse osmosis treatment system. The process looks like this:
- water supply from the water supply system to the pre-treatment system;
- treatment of the liquid by reverse osmosis;
- inflow of water into the storage tank;
- drainage of the liquid with impurities into the sewage system;
- inflow of treated water from the storage tank into the tap (main or additional).
If you want to use this particular filter, you can find here ispring reverse osmosis filter installation www.highwaterstandard.com/ispring-water-filter-installation-nyc.
Flow filter device for water
In contrast to reverse osmosis, flow filters consist of a certain number of containers with filter elements, whose degree of filtration and configuration are different. Three- and two-component devices are the most common. Plumbing water at operating pressure enters the first flask, where it removes mechanical impurities (scale, rust, sludge, sand). Then the liquid flows into the second flask, where it is decontaminated, purified of heavy metals, dioxins, phenol, etc. Decontamination and adsorption are performed with the help of coal cartridges.