I see several laser measure devices at HOme Depot. I need a 130 ft to measure down a water well. What is your experience with measuring water like this....5-6 inch casing......???? and NO I am not buying a HOBO data logger so dont mention it...

I have a hand dug well at my house. I think they called it an artisan well? Could be mistaken. Regardless the well is a large concrete cylinder in my backyard. There is a long crack in it at about surface level and it extends underground about 12 inches. It is large in width just a small crack however water slowly leaks out of it creating an endless puddle around the area that never fully evaporates. I'm concerned it will continue to get bigger each winter until it eventually just splits entirely. Any advice on how best to repair the crack? This is my drinking water so any solution would have to result in the water still being potable. I do have a series of sediment filters and a uv filter that the water passes through after entering the house.