Cattle, Garden, Side Projects

Rainwater Collection Series 3: Purifying Rain Water for Human Use

The last main hurdle of settling on the property is purifying the rain water that has run off the metal barn roof that has been treated with who-knows-what then stored in petroleum based tanks that my leach additional undesirables. Here is the catch, I don’t want to have to use power whatsoever to purify the water (excepting my DC solar pump).

First of all, I plan to purify water for drinking, bathing, washing dishes, cooking and any other miscellaneous needs. Between all of those uses I will conservatively require about 10 gallons a day of purified water. How can I do this without additional energy use?

The first step is a basic filter to remove debris and extend the life of later components. A simple layer of gravel then sand should do the trick.

Here is the gem: Ceramic. During manufacturing, sawdust and silver is mixed into the ceramic clay. When fired in the kiln, the sawdust combusts leaving behind microscopic channels that allows water to travel through the ceramic while bacteria are too large to fit. Silver impregnation provides a hostile surface for microbial activity. A simple scrub with an abrasive sponge removes the top layer of ceramic and refreshes the filter. I haven’t decided on a specific filter yet, but this one is along the lines of what I am considering.

Lastly, a replaceable and homemade activated charcoal filter will remove any chemicals that have leeched into the water on its journey to my farm. With the filter medium available in various quantities, it will be simple to incorporate the homemade and changeable filter into my design.

The last piece of the puzzle is a storage tank. I would prefer a non-petroleum based tank to store the fresh water. Preferable stainless steel and something that could tolerate a bit of pressure when pumping the water out. Does this ring any bells with anyone? If I can legally find a 15.5 gallon half barrel beer keg to use, I will remove the spear and add my own fittings. FYI, most beer kegs including the ones for sale on craigslist are property of the beer distributor who issued the keg when it was full of beer. Any you come across second-hand are technically stolen unless the seller can prove otherwise. Even though I personally view the legal requirement to use a distributor is right up there with cartels and acts a barrier to entry for smaller guys, I’ll still find a keg through legal avenues. Do whatever aligns with your ethics!

Regular water testing will ensure my system is safe and continues to be s0 as it ages.

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