Good grief. The point was not an objection to the cost quotation. The objection is that they are not cow magnets.
Oh, NOW I get it. The meaning of my post escaped you completely. You thought I was claiming that the Algae-X uses cow magnets. Of course it doesn't. The cow magnet reference was in regard to the silly little kit my co-worker saw advertised in a magazine and ordered to install on his car. The two magnets taped to the fuel line thing. The point of THAT story was to demonstrate a) how gullible people can be to pseudo-science claims and b) how people who fall for a gimmick like this will staunchly defend their gullibility despite there being no evidence that it works and that logic and common sense indicate that it can't work.
I have no clue what the in-line treatment units like Algae-X and De Bug TM use for magnets.
Sorry that I totally confused you. I thought it was sufficiently clear that the cow magnet story was not talking about the Algae-X itself.
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