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:

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.

Please contact us immediately to be provided with water filtration equipment, water treatment,… with the best quality, preferential prices, and the most dedicated service. Hotline 0932562177

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