Is comming up from the bottom of the well casing because the well is into a water source that is in sand. This is not unusual. Some of the sand is so fine that it "floats" up to the pump and the pump pumps it with the water. Sometimes this will stop as the well settles out over time, but it is also hard on the pump itself and can wear it out.
Make sure you know the water level before raising the pump. If the pump runs in air too long, it will also burn out. There are pressure switches available to shut off the pump if it starts to run dry.
It is also possible to check the water level yourself. Take a strong cord and tie something small that floats to the end of it. Lower it down into the well until you hear it hit the water. Pull it up and measure the cord length, that will tell you the static water depth.
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