I was checking out an ad for RIO's Deep 7 (7wt)lake fly line with a sink rate of 7-9 ips. I am considering a saltwater set-up that will get down fast yet be okay for casting too. Also thought about using a firm 6 wt. rod, 9ft.(Iron Feather) with this 7 wt. line. Anyone used this Deep 7 line yet? Although it calls itself "lake" fly line is there a problem with saltwater exposure? Does it cast well? I'm thinking this may be good for Silver fishing from our boat this season but wanted to see what others had to say. Thanks!