Works well when the bristles don't fall out into my pool.  I realize these brushes -- and most brushes, for that matter -- are made by a machine that folds the metal bristles in half over a pin, then folds the pin in half and inserts the pin with the captured bristles into the base of the plastic brush.  In my case, the machine missed fully inserting at least one bunch of bristles and during use the bristles fell out.  Luckily, I noticed the missing bristles the next day scattered on an underwater step and was able to retrieve and discard them.  Fortunately no one stepped on the bristles nor did they have a chance to work their way into my new pool pump. The reason I know that that bunch of bristles was not properly inserted was because the bent pin they came loose of was not fully inserted in the plastic head.

I don't think a quick look by a quality control inspector would have spotted this mistake, so I can't fault the mechanical manufacture of the brush.  I inspected the remaining bristles and those that I can see clearly all appear to be fully seated in their respective holes in the plastic base.

Other than that misstep, the brush does a great job of blasting the algae off the pool walls and floor, with not a lot of effort on my part.  So, based solely on the operation of the brush I would have given it 5 stars, if not for the loose bristles.  If you purchase this brush, please take a close look at the finished product before using it.
Works well when the bristles don't fall out into my pool. I realize these brushes -- and most brushes, for that matter -- are made by a machine that folds the metal bristles in half over a pin, then folds the pin in half and inserts the pin with the captured bristles into the base of the plastic brush. In my case, the machine missed fully inserting at least one bunch of bristles and during use the bristles fell out. Luckily, I noticed the missing bristles the next day scattered on an underwater step and was able to retrieve and discard them. Fortunately no one stepped on the bristles nor did they have a chance to work their way into my new pool pump. The reason I know that that bunch of bristles was not properly inserted was because the bent pin they came loose of was not fully inserted in the plastic head. I don't think a quick look by a quality control inspector would have spotted this mistake, so I can't fault the mechanical manufacture of the brush. I inspected the remaining bristles and those that I can see clearly all appear to be fully seated in their respective holes in the plastic base. Other than that misstep, the brush does a great job of blasting the algae off the pool walls and floor, with not a lot of effort on my part. So, based solely on the operation of the brush I would have given it 5 stars, if not for the loose bristles. If you purchase this brush, please take a close look at the finished product before using it.