Hi William,
Thanks for your review.
Regarding filter lifetime
a. Our filter lifetime depends on 2 aspects: the elapsed time and the amount of water consumption.
If one of the two limit has been reached, the corresponding filter will need to be replaced.
Since the different area will have different water condition, the actual lifetime of the filters may vary and the actual situation shall prevail.
How our filter indicator works
---Please note that it is designed based on average water condition; it cannot adjust itself to meet your local water quality.
In other words, it's perfectly normal that a filter needs replacement when the indicator gives no alert yet.
---Please note that you need to reset the corresponding filter lifetime indicator MANUALLY after each replacement since it's not designed to detect a new filter automatically.
If you have encountered any difficulty during the indicator reset process, please note that it does NOT indicate a faulty filter.
If you have any other questions, please feel free to contact us.
We have contacted you by email, could you please provide more details so that we can help you solve the problem?
Kind Regards
Mia Lauren 
1-888-352-3558
service@waterdropfilter.com
Customer Service Rep
Hi Sai,
We are so sorry for the inconvenience caused to you. If you have any problems, please feel free to contact us. If you didn't receive our reply, the message may come into your junk folder.
Kind Regards
Mia Lauren 
1-888-352-3558
service@waterdropfilter.com
Customer Service Rep
Dear customer,
Thank you so much for your positive review. Our whole team is encouraged by your warm reply. It is our great pleasure and honor to deliver our best service to you.
If you have any other inquiries, please feel free to contact us. We will always be there to provide satisfactory solutions for you.
Kind Regards
Mia Lauren 
1-888-352-3558
service@waterdropfilter.com
Customer Service Rep