This is just about the only domestic UV filter that uses (food grade, hopefully) plastic rather than metal - stainless steel or aluminium, both of which deteriorate over time with exposure to UV rays. Stainless steel units are known to develop leaks over time, while aluminium pits on exposure to water over time - at an accelerated pace when it is mineral-rich groundwater. Aluminium is particularly unsuitable since it is a known neurotoxin. However manufacturers defend its use in UV purifiers on the ground that the metal best weathers exposure to UV rays. Plastic too grows brittle with exposure to UV light. But I’ve gone in for a reasoned compromise: I don’t leave the purifier on all the time. Since it is for domestic use, it is not used online with a water cooler. That should take care for longevity. Now for the system qua system. It features a membrane filter, charcoal filter & UV treatment chamber like the other models available in the market. Water quality, I think, is comparable (and safer, since the water does not come in contact with metals of any type within the unit). Where it really falls behind is in auto electronic monitoring. Unlike other units it lacks even the very basic solenoid valve (an electrically-activated spigot that shuts down water in case power supply trips - or if the photo-electric sensor detects an unacceptable level of turbidity in the UV chamber). No photoelectric turbidity detector either. The unit is unsuitable for use online since it continues to produce water (without UV treatment) in case of a power shutdown. The user needs to monitor continuously for power failure/UV light while the unit is in use. In my case I’ve made, like said, a reasoned compromise. I bought the unit online & it cost a reasonable Rs 2, 500/- some 4-5 months back. I am not sure of service support since the unit was (then) not sold through the usual appliance outlets that sold other products of the company. The product arrived packed securely, but there were no installation instructions or even instructions for safe use considering the limitations of the system outlined above. No product literature whatsover - only a handbill that advised the user to throw away the first two buckets of water. Overall, a good buy for the user who knows how.