This bundle deal includes the additives MagiCal and BC Boost from Technaflora. BC Boost is the PK Bloom booster for the line, as it is meant to be added in to the main line when using BC Bloom. MagiCal can be used at any time, as your plant may always need a little boost of magnesium and calcium at any point! MagiCal is a very excellent cal-mag that can be used within any nutrient line that you follow, and this line can be used in Hydroponics, coco, and soil! One package includes a quart of MagiCal and a quart of BC Boost!