Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does this iron use tap water or distilled water to prevent calciumbuild up?
Document: Very easy to use, lightweight  but does the job. Just ironed a linen skirt and it worked great. Love the cordless feature. The water container removes and fits back easily, the cord retracts and the whole thing fits into the protective cover.
This one holds less water than my old iron, which is not a problem. Just refill more often. And, it does not come with a little cup for refilling. Fortunately I saved mine from the old iron. Those are not complaints -- just issues you might want to know. I would give it 5 stars except for 3 reasons: I think the cord is a little short. It is 6'.
Great iron! I originally bought one for my boyfriend before he had a full-time job. When he was wearing nothing but t-shirts, he left it at my house and I used it all the time. Once he began working, he took it back to iron his button down shirts. I missed it so much I had to buy myself one. It works really well, steaming without dripping water all over the place. I love the cordless feature, the removable water container and the little case.
I'm a quilter, and I love being able to move my fabric without a cord getting in the way. Gets very hot, and not too heavy. Easy to refill with water. And I love the carrying case which allows you to put it away hot.
Much easier to use than conventional iron. It heats up very quickly, a good feature. I would recommend this product.
The iron works well. Although when in use you have to return it to the charger every time you put it down, I would suggest this item to friends and family.
Prompt, fast delivery. The descripton of the iron is accurate; lightweight and easy to use but not too powerfull compared to the Rowenta irons I have owned in the past. It does what it is supposed to do and the cordless feature is nice.
This iron is awesome! So easy to use, fast heating, and love having carrying case since I keep mine on my dryer in laundry room keeps it clean. Had Oreck cordless for many years before the Panasonic. Really prefer a cordless iron so after reading reviews decided on this one & haven't been disappointed! MUCH better than the Oreck!
It's not unmanageable, but it IS heavier. I've had surgery for tendinitis in my wrist already and I notice the additional weight. Still, I can use it. I don't really care whether it is cordless or not. My husband liked it and I'm happy enough with it, so it stays. If you want a lighter iron with a burst of steam, keep looking. If you need cordless, this one is an excellent choice.
I don't need the plastic case, but like the iron very much. It heats fast and doesn't leak. Best of all, no cord. I use it to iron my white shirts, tablecloths, napkins, press pants etc. and have had nothing but success with it. The other day I got lazy and used it to iron the round tablecloth ON the table. I'm planning to buy several as Christmas presents for the daughters and daughter in law.
Answer: Distilled water. Not just with your Panasonic L70SRW any iron that uses water.