It's a fad. Just like the fad of having soap filled sponges to wash the dishes. It was popular for a while too and now few are sold because it isn't cost effective. SPNG sponges are ridiculously expensive.
We are apt to shut our eyes against a painful truth... For my part, I am willing to know the whole truth; to know the worst; and to provide for it. --Patrick Henry, Patriot and Hero of the American Revolution
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