I use the gelatin method on two tanks, currently. It works great for me. The gelatin seems to work like a regulator for the yeasts access to the sugar. My batches seeem to have a lot more consistant output and they seem to last longer. I strongly suggest you use it. Also, you can modify the recipe to fit your needs. On my 75g, I make a jello mix of one package of Jello(its cheaper than plain Gelatin here) plus 3 cups water in about 2/3 gallon of water. Then, I let it cool for a little while and pur it into the a one gallon juice jug. Let it sit overnight. Then, the next day I add the yeast. I use champagne yeast, which has worked much better than grocery yeast for me. Also, I rehydrate the yeast per the package directions plus I add one tsp sugar and some baking soda. It take a couple hours and it gets going. I use two bottles in rotation. More sugar to jello = more output/shorter life. More jello to sugar = lower output/longer life. Also, I use a full teaspoon yeast to be sure. I works great and I get about 12-15 ppm CO2 with it.
