Cermedia - marinepure blocks

I have 2 quarts of the spheres in my sump. I also have live rock though. On the Dr fosters and smith website it say 2 quarts is good for 250 gallons. I have a hard time believing that.
 
Ya I see the marinepure website says one block 8*8*4 is good up to 200 gallons. Thats what I am trying to figure out.
 
I am planning on putting one of those big blocks in my sump. They're used at the Aquarium of Niagara and they have a crap load of those big blocks in their system. I'm building a 120gal and have about 100lbs of dry rock and will put just 1 big block in.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

  • Yes!

    Votes: 32 45.7%
  • Not yet, but I have one that I want to buy in mind!

    Votes: 9 12.9%
  • No.

    Votes: 26 37.1%
  • Other (please explain).

    Votes: 3 4.3%

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