The feeder system works best in 2-5 feet of water. We include 5 feet of reinforced line that is strong enough to be run through the smooth carabiner and not break. If you want to run the feeder system in deeper water you should use a longer piece of kevlar line. Long enough that it matches the depth of water you are in. Although it is not listed as a product on our site we can do a custom order for kevlar line. Just contact us and let us know what you need.