Flow though DSB fuge???

[kpk]

I will have a 75g sump/fuge and a 20g sump to hold the skimmer (in the prop tank stand). Does it actually hurt the denitrification process and/or phosphate removal by having fast flow? I want to just have a sump with the full 1700gph-head etc instead of sectioning it off etc. There will be close to 100lbs of sand. Is the slow flow more for the pods etc or for the actually removal of organics/contact time?

 

[papagimp]

Interesting question. I need an answer to that one as well. Common sense tends to tell me that it really wouldn't matter, since it's a closed system where all the water is going to pass over the sandbed several times per hour anyways, but it may.
I'll also be using a 75 sump/fuge with about 1200gph flow, let's see what the peanut gallery has to say on this....

 

[kpk]

That's how I think about it too. It's a closed system always contact right?

Anyone know?