"This well has not been used now for several years and we are getting close to the point where we would like to be able to use it. I am sure the water in there is stagnant from just sitting. When we move the trailer on I will probably have to dig a new line to the well as the old line is gone and buried when they tore the house down. I am thinking about renting a pump and pumping the well down a couple of times and perhaps even "shocking" the well to clean things up.
Anyone have any experience with this?"
yes, i do have experience with this.......
test the water like lazy said FIRST, this can be done by yourself or from someone who services wells............(digs, maintains, etc.....) we have a local guy who dug our well umpteen years ago, did some additional work for us, and they check and maintain our well and pump. they test our water, simple test.
before you invest any money, time and effort of things you don't need..........if your water tests fine, RUN the water through it..........that's it.
if you are concerned about it, hire a knowledgeable person on wells to give you some advise before you start running off on your own with something you don't need.......
shocking it out.............just run it...........and keep running water through........just my HO!