How to get deep fast

[tlspyder13]

My question on the Utah board has grown and now looking for more help and ideas on how to get a fly deep. Right now I have floating 6 wt line and fish small streams and small lakes but am looking to start fishing from a float tube in a large lake and need to get down 20 to 50 ft. Fast sinking line or depth charger line has been suggested but as I have only one real and rod it isn't easy to just change on the lake. I have been looking around and found some poly leaders at Cabela's that are 5ft and make your lines sink. Wondered if anyone had tried them and how well they worked. Good enough for a novice or do I just need to suck it up and get new line. The idea of not having to change lines is nice plus I could take it off and fish shallow if I wanted. Thanks.
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