I want to make Saltpeter, and Cracked Sand can give me a lot. Is there any other way to generate it or to get Saltpeter?
Are you trying to make forestry fertilizer? As far as i know, there isn't a way to generate cracked sand, but if you have Gregtech installed, you can use potassium + nitrogen + compressed air recipe to make saltpeter.
To get the cells, simply put enderpearls from an ender ender into your preferred method for grinding, and put the dust into an industrial electrolyzer with some cells. That will get you the potassium and the nitrogen. Just put cells in a compressor to get the compressed air cells.
Railcraft 6.15.0 (January 30, 2013) added the saltpeter spawner.Saltpeter can also found in Vanilla Deserts. When you found some, dig to Bedrock, there are "Saltpeter Spawner" in the Bedrock (and look like Bedrock). You can move them with a Portelgun or breack it with the Rightclick of a Vajra!
But Saltpeter sill only spawn in Sand and when Sand is on top and bottom of it. You can use a Filler to Fill it with Sand and a Quarry to Dig it out again (cant break the Spawner Block)
PS: I dont know in which Version these things where Added. ultimate 1.0.2 have them)