rowaphos help

[makana]

The 3ppm come from the rowaphos website where it states 100ml removes 3ppm from 100 usg of saltwater. My tank reading is usually around .25 but I am assuming the rest is being used up. I also don't have a HANA so its not the most acurate reading.

I picked up my package and the reactor is a lot bigger than I was expecting. The reactor instructions say to use a minimum depth 2" which is going to be close to 100ml.

So I have a couple of questions. Can I get away with less than the minimum 2" depth? Would that be a hard rule or can I try less and see if I can get the correct flow? The reactor has sponges that are rather coarse. Do I put the the gfo directly on the sponge or add a layer of filter floss? The instructions for the rowaphos say it can be sandwitched between layers of filter floss but I don't think that was for use in a reactor.