Water Chemistry

Hi,
Experimenting with using Kent Nitrogen sponge in a reactor with some low flow for nitrate reduction.
What flow would you suggest for a start and how would you modify it as the filter matures?
I've read about denitrators and flow is in the order of drop per minute... would you think in a reactor setup I should be doing the same or should I have some low flow pump (50GPH?) directly connected?
what should I wait/Look for to modify my flow through it?
Thanks ...