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What is the difference between MF, UF and RO water purification?

MF, UF and RO purification filter out all the suspended and visible impurities such as pebbles, mud, sand, corroded metals, dirt, etc. that are present in water.

MF (Micro Filtration)

The water is passed through a special pore-sized membrane in MF purification to separate microorganisms, MF also is used as pre-filtration. The size of the filtration membrane in the MF purifier is 0.1 Micron. Filters out the suspended and visible impurities only, it cannot remove bacteria and viruses present in water. MF water purifiers work without electricity. Commonly used MF includes PP cartridges and ceramic cartridges.

UF (Ultra Filtration)

UF water purifier contains hollow fiber threaded membrane, and the size of the filtration membrane in the UF purifier is 0.01 Micron. It filters out all the viruses and bacteria in water, but it can't remove dissolved salts and toxic metals. UF water purifiers work without electricity. It suitable for the purification of large amounts of domestic water.

RO (Reverse Osmosis)

RO water purifier requires pressurization and power up. The size of the filtration membrane in the RO purifier is 0.0001 Micron. RO purification removes water dissolved salts and toxic metals, and filters out all the bacteria, viruses, visible and suspended impurities like dirt, mud, sand, pebbles and corroded metals. The purification solved the problem of drinking water.

What are the roles of PP/UF/RO/GAC/Post AC filter?

• PP filter: Reduces impurities larger than 5 microns in water, such as rust, sediment, and suspended solids. It is only used for preliminary water filtration.

• UF filter: Removes harmful substances such as sand, rust, suspended solids, colloids, bacteria, macromolecular organics, etc., and retain mineral trace elements that are beneficial to the human body.

• RO filter: Completely removes bacteria and viruses, reduce heavy metal and industrial pollutants like cadmium and lead.

• GAC (Granular Activated Carbon) filter: Adsorbs the chemical due to its porous qualities. Eliminate turbidity and visible objects, also can be used to remove chemicals that give objectionable odors or tastes to water such as hydrogen sulfide (rotten eggs odor) or chlorine.

• Post AC filter: Gets rid of unpleasant smell from water and enhance water flavor. It is the last step of filtration and improves the taste of water before you drink it.

How long will the filter last?

It will vary by usage and local water conditions, such as incoming water quality and water pressure.

  • PP filter: Recommended 6 – 18 months
  • US Composite filter: Recommended 6 – 18 months
  • Activated Carbon filter: Recommended 6 – 12 months
  • UF filter: Recommended 1 – 2 years
  • RO filter: Recommended 2 - 3 years
  • Long-acting RO filter: 3 - 5 years
How to properly store the water filter cartridge?

If you are not going to use the filter cartridge, please do not unpack it. New water filter cartridge can be stored for about three years and ensured its service life if the following conditions are met.

The ideal storage temperature range is 5°C to 10 °C. In general, the filter cartridge also can be stored at any temperature between 10 °C to 35°C, cool, dry and well ventilated place, kept away from direct sunlight.


RO water purifier needs to be flushed by opening the faucet to drain after an extended shutdown or protracted disuse (more than three days).

Can I change the filter cartridge by myself?


Why should I filter my home water?

There are a lot of pollutants in tap water that people often don’t think about. The most common substances in tap water are the lead and copper remnants from the pipes. When water sits in the pipes for extended period periods and then gets flushed out by the faucet being turned on, those remnants get flushed out with the water. Some people might tell you to let the water run for 15 - 30 seconds before consuming it, but this still doesn’t guarantee anything. You still have to worry about chlorine, pesticides, disease-carrying germs, and other chemicals that can make you sick. If you end up consuming these remnants, it will increase your chances of sickness and having a weakened immune system, bringing on worse problems for you like cancer, skin problems, and possibly even congenital disabilities.

The only solution for cleaner and safer tap water is to filter it first.  Angel water purification products, whole house water filter systems and commercial water systems are effortless to install and operate.

Can I install whole house water purification system even after renovation?


Common Drinking Water Contaminants

While certain water contaminants, like iron, sulfur, and total dissolved solids, are easy to spot by residue, odor, and discolored water, other potentially harmful contaminants, like arsenic and lead, can go undetected by the senses.

Iron in water can cause real damage throughout your home – appliances begin to wear down over time, and limescale buildup and mineral deposits slow down their efficiency, requiring more energy to run.

Arsenic is one of the more dangerous water contaminants because it is both odorless and tasteless, becoming more toxic over time.

Levels of lead in drinking water and tap systems can often pass unnoticed, as it is virtually undetectable to the senses.

Commonly found in many water tables, nitrates are naturally occurring, but can be problematic beyond a certain concentration. Nitrates in water can adversely affect certain populations, like young children and the elderly.

Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA) are fluorinated organic chemicals that have leached into water supplies. These Perfluorochemicals (PFC’s) are hazardous to the environment and are concerning for our health.

Sulfur in Water

The telltale sign of sulfur in water is that unpleasant rotten-egg smell. If that’s not enough, its presence can also be a breeding ground for bacteria, which can lead to problems with plumbing and appliances that can eventually corrode pipes and fixtures.

Total dissolved solids exist in water naturally after it filters through bedrock and soil. Although a certain amount in water is normal, problems start when levels of TDS increase beyond what would accumulate naturally.

What is hard water?

When water is referred to as 'hard' this simply means, that it contains more minerals than ordinary water. These are especially the minerals calcium and magnesium. Magnesium and calcium are positively charged ions. Because of their presence, other positively charged ions will dissolve less easily in hard water than in water that does not contain calcium and magnesium. This is the cause of the fact that soap doesn't really dissolve in hard water.

How much salt does Angel water softener use? How often should I have to add salt?

The amount of salt your Angel water softener uses will depend on several factors, such as the model and size of the softener you have installed, how many people are in your household and how much water they typically use.

Y09: 15kg

Y25/35: >40kg

We recommend keeping your brine tank at least 1/3 full of salt in order to maintain optimal performance. We recommend that you check the salt level in your brine tank at least monthly. Some models of Angel water softeners support low salt alert: S2660-Y25/Y35.