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Aquatic Plants Digest V1 #86
> Poly Filter by PolyBio Marine will most certainly remove virtually
>all benefitial trace elements from a planted tank. It's a fantastic
>filter for removing heavy metals and other wonderful things from your
>water. PolyBio Marine makes excellent water purification filters and
>the fish store certainly didn't mislead you. However, I doubt that it
>is good idea to use this filter, in-line, on a planted tank. If you are
>relying only on the trace elements found in your tap water, the poly
>filter is most likely removing all "trace" of them (pardon the pun).
>
>This type of filter is great for pre-filtering your tank water before a
>water change though. I'm considering using one of these filters as a
>prefilter for my RO/DI unit. I'm hoping it will help extend the life of
>the Deionization filter.
>
>Mike
Good advice; I am only using it short term on a tank I just set up, to
remove what I believe to be excess iron.
Glen