Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: What is the difference between the 3star, 4 star and 5 star? Does it really work? I live in a place with very Hard water. Thank you
Document: 4) Less laundry detergent is needed for the same results and clothes now rinse free of detergent residue. 5) Drinking water, which was excellent anyway, tastes even better. I have also found as has been noted in the manufacturer's literature, a very slight yet not unpleasant effervescence of the CO2 (which was always there), which is now suspended in the water differently.I expect to be continuously happy with the workings of the Scalewatcher 3 Star.
I live in San Diego, which has extremely hard water. Four weeks after installation, the hard water deposits that were on the mouth of my bathroom and kitchen faucets disappeared. Although there will be hard water spots, they will be easier to remove. I highly recommend it. It is an economical and ecologically responsible method of dealing with hard water.
After much research I can confirm that Scalewatcher keeps my bathroom and kitchen scale free. Initially we bought it from an unauthorized dealer and we got a damaged product. After getting our money back we bought a Scalewatcher 3 star from Aqua Genesis USA and we got great tech support for installation (it was really easy) and a 10 year warranty included. It works great, no more heavy bags of salt for us.
The scalewatcher is great. Took all of 15 minutes to set up....and the results were tangible and immediate. I noticed a difference in the hardness of the water with my very first shower. After 30 days I also noticed a considerable difference in the flow of water out of my faucets. The calcium deposits have all but dissappeared and the showerheads and faucets flow now versus sputtering. As someone who toiled with salt bags and water softener repairs for years, this is a lowcost godsend.
When I first installed this device I didn't feel any difference in the water. After 30 days I started regretting that I had paid hundreds of dollars for something that wasn't working. I just left it on and slowly but surely I started noticing that the water was getting softer. After using it for a year now, I am happy with it. It has saved me about a $500 in water softening service. I wash my car now at home instead of taking it to a carwash.
:)  Again, a good indication of what type of company/owner I am dealing with.At the end of the day, there are 4 things I want to see happen:1. No scale buildup on or around water dispensing devices2. Easier to clean shower glass (I expect to see water spots but I want them easily cleaned)3. No need to periodically run vinegar through the dishwasher or coffee maker4.
Here is the run-down on my experience.1. The shower:  The very first morning after the device was installed I noticed that my shower water felt soft even though the conventional system had been on "bypass" for several months. The "softness" from Scalewatcher was about midway between that of my hard water and my conventionally softened water.
After moving into a home with very hard water, I waited several years to buy a conventional softener system. Because I garden and do not want to "salt" my plants, I bypassed that system for a good six months of the year. For these reasons, there was considerable calcification on my shower stalls and hardware, on my dishwasher, and in my toilets.
None of this worked very well, and it was a frustrating enough situation that I had taken to doing most dishes by hand.The manual that comes with the Scalewatcher warns that for the first few weeks your dishwasher may actually perform LESS well than before, as previous calcification is released into the water. To give the device a chance to do its work, I persisted in using my dishwasher - and then rewashing glasses and silverware when necessary.
Like others, at first I was very hesitant about this and very skeptical regarding whether it would actually work. We have a superb Corian kitchen counter-top with a white basin. After a couple of weeks following my installation of the ScaleWatcher 3, the white Corian basin was becoming cleaner and brighter than with our previous salt water-softener unit! Shower and bath water became increasingly more clean-feeling and excellent... leaving no noticeable residue in the tub.
Answer: yes