I’d hate to be forced to rely on rainwater alone, but if I must then a quality filtration system is crucial. If you want to copy the design discussed in the video below, please see the video description for links, but be aware that some of the products referenced are no longer for sale because this is an older video. Also know that you will easily spend several hundred dollars or more if you want to replicate what’s shown.
A far less complex solution is to use a gravity water filter. The problem is that it takes significant effort to keep up with filling and draining water all the time, and since we’re accustomed to doing nothing to keep our water clean–because it’s already been done for us–a system like this might be just the thing for long-term rainwater harvesting when times get tough…
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