Hi please fallow the links provided by Homer_Simpson they are by far the most correct !!!!!!! the only thing you need to know is when they talk about deep or shallow well shallow wells for the most part are just that less than 50 most of the time less than 25 feet deep 2nd when they talk about depth of well what they really mean is the depth of water in well so you need to first sound you well this is done by a small 1.5 - 5 weight on a line if you know about how deep your well is.. you were told by a well person or have record of it this will give you a idea of how long of line you will need I use a 300 ft nylon tape measure home improvement stores have them 10-30 dollars but you may have friend that has one. So here I will try to walk you through it 1st clean off then power wash of top of well head and concrete pad check to make sure water runs away not sits on top or around if it is correct this!! 2nd open top were the seal is and inspect it was there any way bugs slugs rodents could have or getting washed in will cont next postingI have a well and I heard you can pour a little bleach down in there to rid some of the smell. Is it ok to this? And ok to drink the water afterwards?