Difference between RO and DI

The difference between technology RO water filter and What is DI?

First, you need to know RO filter and DI uses various physical reactions to purify water.
Reverse osmosis (RO) is commonly used to partially purify tap water to make it about 90% to 99% pure.
Deionization (DI) filters exchange positive hydrogen and hydroxyl molecules for positive and negative contaminant molecules in the water. DI filtration and other processes are sometimes called “water polishing.”

To answer the question more specifically, Nam Viet offers the following comparison table:

RO SYSTEM	DI SYSTEM
The RO system uses semi-filtration membranes RO permeate with reverse osmosis principle completely removes harmful substances water, especially heavy metals such as Mn, Cu, Pb, Hg, As,…	DI (DEMINERALIZATION) technology, also known as demineralization is to remove inorganic salts dissolved in water by ion exchange method. Generation DI system includes 2 filter columns: Cation column removes positively charged ions (Na2+, Ca2+, Mg2+…), Anions remove negatively charged ions (Cl -, SO42-, NO3 -…) DI demineralization systems use granules Ion exchange resin to remove ions in water. The cation resin beads will helps remove negative ions and anion resin beads remove positive ions.
There must be a pre-treatment system (filtration coarse, deodorizing, softening) front to reduce the load on the RO system and protect the filter membrane RO avoids damage to ensure system performance and increase longevity RO membrane life	There must be a pre-treatment system (filtration coarse, deodorizing, softening) front to reduce the load on the DI system to ensure efficiency system’s working efficiency, increasing the life of plastic beads.
Substances to be removed are automatically transferred directed to the waste pipe and discharged outside, but there is still a small amount of trash Unremoved substances remain on the filter surface, causing blockage of the RO membrane → need to be used Use anti-clogging chemicals to protect the RO membrane.	The ions that need to be removed stick to the surface surface of plastic beads, so after a short period of operation, the plastic beads will be damaged inert and needs to be reconstituted → must have a plastic granule reconstitution system.
Environmental friendliness. Are not impact and ensure environmental hygiene.	Plastic pellets are reconstituted with acid (Cation resin) and base (Anion resin) → unsafe to transport practice and pollute the environment
Works continuously, thanks to the system Runs automatically according to PLC or according to user needs.	Operational interruption due to shutdown system to reconstitute filter material.
Output water quality is stable.	Output water quality is unstable and depends on the material reconstitution process.
Water flow into the system RO must be larger than the required flow (about 1.5 ÷ 2 times) because part of the water is absorbed Dispose of impurities.	Inlet and outlet water flow from the DI system is the same.
High investment costs.	Low investment costs.
Safety in operation, maintenance, Does not pose a danger to operators and users.	Safety in operation is low due to The chemicals (Acid or Base) used for reconstitution are dangerous chemicals.
Low operating costs.	High operating costs.

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