What about water purifiers? Which brand is good to use?

In fact, the purchase of water purifiers before the first test of their own water quality, and then choose the appropriate cartridge, and the cartridge to be replaced later, so the after-sales service must be good, otherwise the back is very troublesome. Finally look at the price, after all, the price is also a very important factor. Like my family use Healy's water purifier filtration effect is very satisfactory, low noise, long service life, reliable operation quality.