Wall Water Features - What features shall a water purifier have to make it 100% safe?

What features shall a water purifier have to make it 100% safe?

Before buying a water purifier for what features shall i look for to make its water 100% safe? Thanks

basic check: 1) ur budget 2) does it solve the purpose of purifying water 3) average maintenance costs 4) guarantee / warrantee 5) colour preference
Combination of UV + Sediment filter + Activated carbon ----- Output 100% pure water .........check out Philips wp 3893........one of the best water purifier
To begin with a water purifier may be 100% safe. But on prolonged use the water purifier becomes defective. Many things can go bad. The filter may become defective, the membranes may be fouled, the UV lamp may not be working properly, etc. A little more safety is available if the water is boiled for 20 minutes. If you want to buy a water purifier go for a well known company made unit. Also ensure that you get after sales service in your home.