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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make sure you understand the difference between a filter and a purifier as you assess your options. That difference drove me to the most prominent maker and we use that water for all drinking and cooking. Cost is time dependent - replacing filters every three months vs replacing purifying filters every 4 years (that's what our usage will lead to)
Also nominal and absolute.