Help with buying phosban reactor

[fhd]

Hi all, I would like to buy one of those stuff before adding any coral, but my question which size I need if my tank size 200 gallon+ 50 gallon for sump - the rock and other pumb skimmer wich will reduce the volume around 30 to 40 gallon, please advise me and how mach of media I should use 200ml or 400ml, otherwise I can make my own DIY, but I need to know the quantity of NPX bag, pleas help

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[bvysochin]

Phosban reactor or bio pellet reactor? If you're talking phosban, I would start off slow and add a little at a time, changing it more frequently. Phosban is good at what it does and getting rid of phosphates too quickly can cause much more harm then good. I'd suggest a 1/4 to 1/2 cup to start off with.. if you meant biopellets , maybe someone else can help you as I choose not to use them.