It is common today for people to want to live off the grid. It could be that they want to be safe in case there is an emergency, they might be concerned with the impact they have on the environment, or maybe they just want to save some money. Catching rainwater can be a very low-tech, cheap way to go off the grid, but depending on what you want to use it for, you have a few things to consider.
Drinking water will require purification and filtering, and this might be beyond the scope of what you want to do. On the other hand, if you are just looking to use the water for crops, flushing your toilets and washing your clothes, then the process is much simpler.
It is important to consider the surface you use to collect the water. If there is flaking paint on it, make sure that it does not contain lead. If there are bird droppings on it, the water could carry disease, as well.
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