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3.5lb =1.58KG and you will need at least 2.5-3kg so it's still a better deal to get the 5kg at $100 . also i am not sure but i think premium aquatics have the carib sea media not like the H&S media...
i don't know if you keep coral in your system or not but if yes you will need calc reactor because the sulphur will reduce the alk very quick and it's can cause problem with coral (in mine it's reduce from 10DKH to 5DKH when my reactor was off)
anyway in this unit you can put without problem 2.5-3kg and then to add on it the arm media but keep 2" from the top clear form media . the besic it's like calc reactor first fill the unit with the water and let it flow free from the effluent till the bubble (air) will gone after that turn the recirculating and adjust the effluent 1 drip/sec.
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