I bought a pair of these so I don't have to use my trolling kicker all the time. I have a 19ft fiberglass boat with an Evinrude 115. The slowest speed I can get is about 2.6-2.8mph on flat water with GPS. 1 sachet reduces speed by about 1 km/h. I trolled at 1.6-1.8 for several hours without much effort. 2 sacks make me crawl and for trolling I have to increase my speed a bit. So far this has been a great option for me. Let's look at durability.
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