The only think that I kinda don't like.. ( but well worth this filter) is the seal to control flow to intake/impeller has to be good to get a good suction going. On water changes if it looses suction, I have to coax, pray, flood, and beat it into starting back up. Every few months on my second nature I have to glue the white mounts back on the impeller... beside that I love em. I wish all new filters had adjustable flow.... anyone have older filters?