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This is a great project to have at home for that just in case moment. Bio-filters are a great alternative
This is a great DIY option to learn about in the event SHTF and you need a clean water filtration system larger than a Lifestraw. As you can see by the picture the water filters through three separate layers, gravel, sand and activated charcoal. The gravel removes the large pieces of debris, the sand removes the smaller particulate matter and finally the activated charcoal removes bacteria and some chemicals. However this system does not completely remove 100% of everything harmful.
To completely kill all pathogens just boil the filtered water. See how to make this awesome long term water filter below:
Bonus: How To Grow a Backyard Supermarket
Having a backyard supermarket will allow you to grow pork and beef, chicken, organic eggs, non-GMO fresh fruits and veggies, including all the essential components you need to make your food staples, desserts, and even drinks.
If you are willing to put in a little elbow grease, this isn't too good to be true. The good news is that some of this can be automated.
Our great-grandfathers and great-grandmothers did this every single day. It's called "homesteading", and it can help you save money on food, furniture, tools, clothes, and much more!
This is as self-sufficient as it gets. Watch this eye-opening video to learn more:
Homesteading will take you back to the roots of your ancestors. It's not only a healthy, stress-reducing pursuit, it's a lifestyle.