I just switched to BrightLine filter glass, when I replaced my liner, I debated some time switching over from sand. What pushed me over, was glasses purported ability to filter metals from the water. My well is high in iron, and is an ongoing battle, wish I had found TFP sooner, would have saved a bundle on buying chemicals I didn't need. However it has performed as advertised, in regards to filtering out iron in my pool, I wish I had filmed the first backwash, the rust brown sludge, blew my mind. I've backwashed 4 times this month, not due to a weekly schedule, but hitting my 25% filter pressure. Pool's crystal clear, I'm using a metal filter to top off, and have switched over to Jack's Magic The Pink Stuff, a sequestrant, and using their test kit monitor/maintain appropriate levels. I'm glad to have switched media, but now I'm confused about using it, some sites say swap pound for pound, BrightLine says use 20% less (I used 180# in a 200# sand filter, per their instructions). What about maintenance? Does it require cleaning, like sand? Does it really filter down to 5 microns? Will it last 3 times longer than sand? I don't know...