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If SHTF you could experience a drastic disruption to your water supply.
Given the importance of water for survival, having a reliable source of water after a disaster needs to be one of your main priorities.
Even worse, if the grid goes down it will be extremely difficult to pump water from a source, so taking the right precautions will be invaluable.
Consider a hydro-powered water pump that requires no external energy (electric, solar or otherwise) using only the current of the water to power your water pump.
It works due to the water in the wheel being higher than the release pipe, the larger the wheel the more pressure you will have to pump the water.
More coils provide a greater head lift, or ability to pump uphill. What an ingenious idea that could be a lifesaver.