My friend in US recommended this filter to me. After searching around, I found amazon sells this product in a reasonable price.Before I start to use this filter, I'm afraid whether I can install it by myself as I am not good in it. When I opened the box, the instruction for installation is clear, the installation procedure is so easy for a dumber like me.It's convenient to use as well, the LED indicator can tell me when to change the filter clearly. Unlike other filters my friend is using, they need to either remember the time or check the color of the filter. I'll continuously use this product and recommend to my friends.