another question is espring...

http://www.amway.com/at-home/eSpring/technology

compare to others brand....espring technology only have ULTRAVIOLET TECHNOLOGY and  CARBON FILTER TECHNOLOGY

ULTRAVIOLET TECHNOLOGY ---The eSpring® Water Purifier is unique when compared to other in-home purifiers because it contains an all-in-one cartridge with an ultraviolet (UV) lamp inside a carbon-block filter* to treat water without chemicals. The UV bulb exposes water to powerful UV doses up 80 millijoules (units of measure) per square centimeter. The Water Purifier also reduces more than 140 potential health-effect contaminants that may be present in drinking water with its multistage, pressed carbon-block filter.

CARBON FILTER TECHNOLOGY --The eSpring® System uses a patented, multi-stage carbon block that:
Reduces chlorine taste and odor
Traps particulates to boost water clarity
Effectively reduces over 140 possible health-effect contaminants

**how can it reduces over 140 possible health-effect contaminants only using CARBON FILTER TECHNOLOGY????

Anyone using LEC outdoor sand filter ?

So you mean LEC, Gen Air and Perfect Steel are all the same?

So can I confirm the three companies are LEC, Gen Air and Perfect Steel? All of these are OEM from Alphamax, correct?

should be RO water filter and filter that has additional UV filtering.
For additional UV filtering, unless you insist to pay RM3k-RM4k for an UV equipped water filter,  you can simply boiled the water to replace the UV function or you can actually DIY add on UV filter to your existing filter for less than RM100.
The problem is people don't know where to buy the UV filter. Thus,  I'm sharing these chinese key words for you guys to key into Taobao product search.
家用紫外线杀菌消毒净水机