Other than hanging a bag filled with carbon in the sump,
what do you use to make carbon work more efficiently?

Tha idea with a bag works, but in my understanding
water would penetrate carbon better if it was flowing
forced through not around the bag...

I was trying to put a layer of carbon in the phosphate
reactor, but carbon is very light and it is easily
lifted up with water and travels back to my tank...

How do you put carbon to work in your reef tanks?