Definition - shocking a well: adding chlorine bleach after the pump was pulled, the purpose of which is to kill bacteria that may have been introducedWe had to shock our well as part of a project to get us more water. Of course, this is followed by a period of alternatively flushing the well and letting it recover over at least a day, in order to reduce the chlorine concentration until it is at safe levels. Since we knew how much water was in our well (how many feet of water times 1.5 gallons per foot), using this device was MUCH more accurate than just running the pump for a set period of minutes each time. Though it was by far the least expensive part of the project I personally think it made the whole process a lot easier to deal with and was a great tool in boosting my confidence that I'd not run the well dry - consequently burning out the pump (water keeps it cool).Is it cheap plastic? Yup, so don't abuse it or purchase it thinking it's a pro-grade tool.Is the display tiny? Yup, but still sufficient and easy enough to read.Are the buttons marked? Nope, so read the little pamphlet it came with or experiment - there are two buttons. How hard can it be.I'd definitely buy it again.I'm having to water a damaged tree 220 gallons/watering to offset some root damage from an over-eager excavator next door. I was estimating the water used based on the size of the hose and the time spent. I got this to double-check. It pretty much matches what I was coming up with my calculations, so I hope that means it's accurate, but I have no way to know. It is very easy to use; just put it in line with the hose and soaker hose.Unfortunately the unit is simply too fragile because the plumbing bits are made of polymer, not metal. In particular the input side flange to the main body is very thin walled and not really sufficiently shear resistant for the purpose. Within hours of its 1st use the input side flange got torn off the body with only mild loads, completely destroying the unit. It is difficult to reinforce at this location without decreasing the lumen and/or having a large change in wall thickness (which would make molding more difficult) so I have some sympathy for the designer, but really using a polymer for the fittings, even a tough glass-filled one, is basically not fit for purpose.For a fixed service, like with a nearby anchored spool or fixed watering system (which was my original application) it is likely fine if you are careful. However with a normal garden hose and its associated transient high loads when you are dragging it around the yard it will very rapidly be broken unless robustly strain-relieved.Otherwise the water flow measurement part works fine. Supports litres and gallons, two counts with independent resets and single decimal place (100 ml or 16 fl oz resolution - not clear if it integrates internally at higher resolution, the mechanism is an axial-flow turbine with magnetic read-out). Wakes upon flow or button push. Transreflective LCD without back-light, lithium battery in a holder with a good o-ring seal, battery should last a long time, standby power seems minuscule. Almost certainly will not tolerate freezing for both the battery and LCD, if not the water expansion.It does restrict the flow a little bit, but probably not significantly for most applications. You can hear the turbulence and vibration of the turbine bearings at high flow rates. I didn't measure the pressure drop across it, or its accuracy because it broke before I had a chance to do so.Filled up a 5 gallon bucket to test the accuracy. Worked well, Filled up my 70 gallon fresh water tank on my RV. It reported 67.5 gallons. Probably had a couple of gallon on board so it is useful for me.Works well and easy to use. But only goes up to 1000 gallons. I wanted to track how much water I add to my pool each month. But it rolls the counter too often.Seems to be pretty accurate. Tested it on a couple known amounts. Use it to add water to my black tank, so I don't have to carry a bucket .I would highly recommend it works great !This meter works as advertised. One set tracks current use, and the other set counts total consumed. Both are re-settable.Product is garbage, it leaks below the threaded inlet connection. I tightened as much as possible without breaking it (made of plastic). I also tried replacing the gasket.Disappointed that amazon will not allow a return or exchange because they state safety issues because it might contain hydrocarbons.How or why anyone would put hydrocarbons thru a device that’s not rated for it and comes with garden hose threads is beyond me.Don’t buy, if you really need a flow meter look at something else!The Orbit Water Flow Hose End Water Meter is easy to use and works pretty good; however it's not 100% accurate, I found it to be shy between 3 and 5 gallons. If you want 100% you will have to pay out the top dollar for it. Would I recommend this, absolutely for the dollar mark it's a good product.Used this this summer for our epic RV trip to the arctic ocean. Did not want to haul extra water around, so with this I could fill the tank with exactly the amount I needed. If it was, say, 3 days between available potable water sources and we use 30L of water per day, I would fill 3*30L=90L into the tank. Just like that. Worked flawlessly. Of course, it could also be set to measure in gallons.I use it when filling the RV to calculate how full our other tanks are. The one is resetable and gal or li.Worked well for about a month now didn't work out only works when it wants to