By my calculations if your concentrate is 1:1 then you should be filling the feeder with half concentrate and half water.
Example: If you put 1 part concentrate to 3 parts water. 4 ounces of concentrate would require 12 ounce of water, but your 4 ounces of concentrate only contains only 2 ounces of sugar, the other 2 ounces is water so you would have a feeder with 14 ounces of water and only 2 sugar. That's a 1:7 ratio of sugar to water.
Example: If you put 1 part concentrate to 1 part water. 4 ounces of concentrate would require 4 ounces of water. The concentrate contain two ounces of sugar leaving 6 ounces of water = 1:4 sugar to water.
