re: Well water comes out red

In a well water with no oxygen (anoxic) and which has has a high iron content, the iron is soluble and in solution, but once it is pumped from the ground and exposed to oxygen in the atmosphere, soluble iron chemically reacts with oxygen and insoluble iron oxide forms (“rust”) - the iron oxide then precipitates from solution - this is the red particles you are seeing. You’ll need to filter the iron particles out with an appropriate filtration system if you are using it in household.