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

Input:
Question: are there replacement scrub brushes for this model P-620 and if so what size brush and where can you buy them
Document: Well I just purchased the Koblenz P-620 and I tried it out on my bathroom tiled floor with murphy soap and the brushes it worked great it was a little noisy but it glides with ease and it lifted the dirt off the floor. I am impressed with the results and can't wait to do my wood floors it a great little machine and it is worth the price.
I bought this so I wouldn't have to scrub grout in the kitchen. This works great. I do put my foot on the top edge of it so the brushes get into the grout, because they didn't get it clean without me doing that.
After using two timeThe bristles on the brush were a disappointment. They shed worse than my dog! ,what a mess bristles  all over the place,good machine ,bad brushes I  was going to send it ,but my health problems come first
This is an awesome little machine. It scrubbed our hardwood, waxed and buffed it. You can buy the big pads for an industrial machine at a home improvement store cheap and trim them to fit this. It will shine up the pergo and vinyl floors too with a soft pad and just something like Windex  spray or vinegar and water. I have even CAREFULLY fluffed up an area rug with the brushes. I have fibromyalgia and it is easy for me to use.
This floor cleaning machine was purchased to Wax, Buff and polish stained concrete floors in my personal home. About 2000 square feet of the house are stained concrete floors. The Koblenz P-620A makes for a quick fix to scratches and an inexpensive way to burn additional wax in, when necessary. I am very pleased with this purchase off of Amazon and would recommend it for someone maintaining a residential area no more than 2000-3000 square foot. Easy to clean and change out pads and brushes.
Wish I could give it more stars. This was a exact replacement for a 10-year old machine that finally went bad. We use it outdoors on the pressure treated decks instead of pressure washing. The pressure washing tears up the wood while the Koblenz machines standard stiff brushes do not. Plain water sprayed directly at the rotating brushes at normal hose pressure carries away the dirt and algae that scrapes off the woods surface. Now I need to sell my pressure washer.
Don't let the price or size full you this little light weight machine does what it supposed to do SCRUB FLOORS saving me my back and knees.
I use it to scrub my floors. In the past, I had to scrub my floors by hand.Once I got this unit, it's so much less work.Quality item that works great.
Much easier on me than mopping or brush scrubbing, works far better than the steam mop or the regular mop or the swifter mop and I still have energy for my next project when I'm done.
They look the same in the illustrations. If so, I'm really glad I got this one, as the 1800 costs almost a hundred dollars more.I'm very happy with my purchase, and my only regret is that I didn't buy this sooner!
Answer: Hi, you can buy them on Amazon