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Normally, I try to avoid purchasing anything from Amazon, but this is a rare exception since I can't find this elsewhere, it's an essential item, and I can't convince my family to install a full-blown filter, but at least my family won't scold me for drinking water out of the rain bucket anymore.
@xianc78 filter your rain bucket with it 
@xianc78 oh yeah these are commonplace in russia, they just work
@lina They should be common place in America too, but most people aren't awake to the fluoride scam.
IT'S FINALLY HERE!!! I'M FLUORIDE FREE!!!
Suck it Bill Gates, Klaus Schwab, my local water utility company, and all the other population control freaks!
Expect a review soon.