Any natural setup using sand, rocks, charcoal that makes it more economical than store bought filters? And, how much of the impurities do they actually take out.
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We have a Berkey filter with the fluoride filter
https://4perfectwater.com/blog/berkey-filter
Reverse Osmosis is probably your best bet. Right now I'm using a 1micron to .5 micron nominal filter. Far better than hard water but I still need to have it tested.
The carbon filters can last up to 4 years but the fluoride filters last about a year.
https://4perfectwater.com/blog/berkey-filter