Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How long do the filters last?
Document: Had it up and running under the kitchen sink within about an hour. Works great, as advertised, I'll have to order a few backup filters now.
Worked perfect. Easy to install. Took longer to arrive because it wasn't prime. But worth the wait. The last one I ordered leaked everywhere and had vague instructions. Not this one.
I 'll update in a while if we have anymore problems.If it works well from here on out, I'll be happy. It was just very dissapointing to have a broken fitting and leaky filters upon installation.
I expected better than this.During installation I had some leaks -- I didn't insert one of the plastic tubes in sufficiently and the whole area under my sink filled with water overnight. Perhaps that is my fault, but it wasn't easy to tell I had a leak until the next morning.Now I am trying to replace the filters. I replaced the sediment and carbon ones fine. But I cannot figure out how to replace the polishing one. There are no instructions with it on how to replace it.
Plumber installed the unit in about a half hour including a line the the ice maker. The water tastes great and measured very low in contaminants. Replacement cost of the three prefilters is about $60, very cost effective since I plan on replacing annually. No problems encounters after 2 weeks of using it. I would definitely recommend this unit. My Pur at the faucet head was costing about $10/mth for filters and the water was not as good as this. Not even close.
We bought this RO system to replace a 16-year-old MultiPure RO System. It cost much less for the new system than it would to buy replacement filters for the MultiPure.We appreciated the detailed installation instructions. We've had the system for one month. It works well and the water tastes great. This RO sytem is a great bargain. I suggest the retailer include the shipping cost in the price, and offer &#34;free&#34; shipping.
works well, easy to install took all of 15 min to hook up and water taste great. I would recommend this product to everybody looking to improve there quality of water.
water taste good and pure , no problem with unit easy to install. I this product recommend it to anyone
good price, easy installation for under the sink application. only took about one half hour to install and works perfectly. did not need to purchase any extra plumbing parts.
We have very hard water and it occasionally has a bit of a chlorine odor (made the ice cubes unusable). Also, I'm cheap and lazy -- I was tired of going to the store every two weeks to for 25 (5 x 5 gallon bottles) gallons of filtered water. Lugging them from the car down to the basement, then from the basement up to the kitchen.Now we have clean clear water for drinking, coffee, cooking, baby formula, and the fish aquarium.
Answer: I contacted the manufacturer in Vista, CA with the same question.  The answer I received is that the life of the filters depends on the water. I live in Yuma, AZ where the water is very hard and full of minerals.  I was told to change the filter elements every year.  They aren't that expensive and it would be worth it to me to change them out yearly.