Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Product Life Span How long does each filter last? Does it fade after only a few uses? If so how many times can you refill the bottle until you need to order more filters?
Document: I purchased these as an add-on when I bought the Brita filtered water bottle. Great price and I'm hoping to get at least 1-2 months out of each filter. We don't refill the bottle multiple times every day, so hopefully this extends the life of the filter.
Ordered multiple times. Good price for two filters, last me about 2 months each. Each filter is individually plastic wrapped.
This is the perfect water bottle for my on-the-go life. With the filter right in the water bottle, I never have to worry about having clean water to drink. This is a great product!
Bought with Amazon prime - came in perfect timing. Love brita, I'll be a life long user. Great price on the filter too. Go brita go!
As far as filters go, this is a great filter for an already great product. The Brita water bottle system is an innovative system that lets users enjoy clean and refreshing water anywhere, regardless of how they source the water. These replacement filters are inexpensive, and last for quite a while.
I use many types of Brita filters and this one worked just like the others. I need to use filters with the water in our house and Brita works great.
My son uses these for his water bottle. He's so picky, so that tells me a lot. Saved me tons on bottled water and makes me feel much better about the plastic WASTE, something we all need to consider. Will have to keep a good stock on hand!!! !
My mom always carries a bottle of filtered water with her everywhere. I got her these Brita filter bottles and extra filters for Christmas so she can refill her bottles on the go wherever she is. So convenient. Not sure why Amazon is indicating that at $10 for the 2-pack replacement filters, you are saving $17 off retail.
Bought the Brita bottle set as well as a box of replacement filters. I have loved my Brita for many years and was delighted to see them bring out a portable bottle/filter system. Now I can have great tasting water wherever I go.
These filters work well in the Brita squeeze bottles, and seem to last a long time in my bottles thanks
Answer: According to the label on the bottle packaging, it replaces 150 16.9 oz bottles.  So, for the 24oz filter bottle that equals about 105 refillings.  Also, the packaging says with average use, you need to replace the filter every 2 months.  Obviously, you need to change it more often if you use it a lot.