Swamp Cooler

This is the swamp cooler I'm using to keep fermentation temps somewhat under control for the IPA I brewed this weekend. Ambient temp is about 69 - 74 deg., depending on the time of day. Theres about 2 inches of water in the bottom of the tub, and I'm rotating ice packs in there, water temp varies from about 60 - 65. Just checked the very active fermenting wort, temp is about 68 or so. Seems to be working! Pic below: