Once this is done, place three double chests.
This system is disliked among a majority of the Borderlands community, and there is a way to work around it, without using a software to edit your save data.
Infusing is, basically, pumping up the stats of your weapons, armors and helmets by using Minions, this grants a lot of bonuses that may or may not be good, such as Fire Damage, Health Regen, etc.