I have a spa that has 3/4" glass tiles. I read in the forums to get a stainless steel brush, but it steel might scratch the glass. I have tried several brushes and after 6 months or less the bristles start falling out. What is the best pool brush to buy? If you can be specific, that would be great. Most of the forums mention brands, but not which is the best brush or where they got it. If you bought a brush that has lasted a long time is is not steel, thank you for the advise. Also, Is there a brush on amazon that someone can recommend?