01-10-2013, 08:36 AM
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I had a vortex diatom filter in the old days too. They likely didn't catch on really because of their cost and specialized use. They really can't be used routinely as the flow rate is way too fast. A bit of a pain as the media would need replacing pretty quickly and it has to be torn apart to do that.
However, as a weekly treatment, it produced some really crystal clear water.
Nowadays, I have crystal clear water with a good filter and some Seachem Purigen so I don't think I'd spend the money for a diatom or other expensive micron filter.