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RE: [APD] sand choices
> >I've used it for decades. Works fine. It contains metal particles
> >though which you could remove with a magnet. I don't bother. Recall
> >Horst and Kippers water analysis of crypt water. 1.5ppm of
> both ferric
> >and ferrous iron.
> I take it does not vacuum well?
It is a skill that must be acquired from experience. You have to sort
of skim above the surface. It can be done, though.
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