Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: How often does the mop pad need to be replaced? Every time? Years?
Document: We have a lot of tile in our home (1800 sq ft), and a two and four year old, so a mop is a critical item. I started with a traditional mop, but I hate having to run to the sink to rinse them out every few minutes, and in AZ, the mop heads go sour after only a few uses. A steam mop get rid of both problems, since I only need to stop to rinse or change out the pad once while mopping.
We also add a little Pine Sol in the water. I don't know that you need it, but found that the floor feels cleaner. Also, this mop doesn't produce as much steam as our old Shark, but I don't feel like I need it, since the pad is really hot whenever I check it (I don't know how this would affect things if I didn't add water to the floor).
If it doesn't, I flip the unit over to the scrubbing side of the mop pad and attack the offending spot that way.Filling it is easy with the cup provided. (I disagree with the reviewer who stated otherwise) Additionally, you do not have to empty any unused water unless you plan on storing it long term. (Even then, I'm not sure you need to)  Another reviewer mentioned adding Fabuloso to the water. I wouldn't suggest you do this. The manual specifically states to use water only.
You can only do a few more strokes before there is no more steam and you have to stop and do it again.The next issue I had was the amount of dirt on the mopping pad. It wasn't enough. I know how dirty my floors get as I've been cleaning them by hand, on my knees, with rags, for years. The amount of dirt I saw on the pad of this thing wasn't anywhere near the amount of dirt I can get up with a rag.
I love this mop. I only wish I would have gotten one sooner. Absolutely cleans floors with ease. Things I had to scrub come right up. Also no chemicals. Just distilled water. No more on my knees again. Something I thought I didn't need I certainly did. No buyers remorse here.
This is my second steam mop and my first Shark. My last steam mop was a Bissell bought at Target on a Black Friday sale. It lasted years! So when it died I set out looking for a replacement. I saw this one on sale at Best Buy and thought it would work. And it does.
However, with the two year protection, if we only get two years use out of it, it was well worth the $50. Either way, after using a steam mop, I would never go back to a regular, and after using Sonic, I would never want to go back to traditional scrubbing.
This steam mop is excellent. The Sonic feature coupled with the &#34;rough&#34; side of the cleaning pad is awesome for getting up stubborn junk on the floor. The cord is just the right length and the water reservoir holds a decent amount. I highly recommend it!
After breaking the bottom line Shark Euro Pro I had.. I got this one!! I LOVE the updated pads that assist the &#34;Sonic&#34; feature... Cleans light years better and also makes the job FASTER!!! I have NOTHING bad to say about this steam mop!! I LOVE IT!
I turn on the sonic and just run it over the floor like I was vacuuming. If I hit a hard spot, I just flip it over and let the sonic motor scrub it off (or add a little pressure for really hard spots). We're in a new home, and we've had problems with our feet being black. It had improved some over time, but with this mop we've seen a big improvement in the month we've used it.A few notes.
Answer: It all depends how often you use it. I'm currently using the original pads and I use it weekly . It just needs washing and it's good as new .