Originally Posted by evasion
why I read everywhere that it doesn't work with shallow waters?
Will they still work in 4-5 feet of water?
In large part they work by lifting warmer water from below; they work better in deeper water. To work properly in Canada, you may need deeper water; down here, not so much.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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