If you already know the composition of the water (submitted it for examination) and want to QUICKLY (and cheaply) check how your filter works (does it filter at least some +/- ions), or if you don’t have anything at all to determine the quality of water, then measurement resistance / conductivity of water can help you at least something. And if you do not like cheap and scary outwardly similar devices, then Kasayomi is our choice! (Mine - so exactly, but I have already ordered test strips for myself and plan to give water for analysis).
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