Evoponic - PK Bulk (0-18-20)Produces Massively Over Sized Fruits! PK Bulk is the latest evolution in PK boosters. Naturally, it delivers large quantities of phosphorus and potassium, but this formula also includes an array of plant hormones (derived from natural sources) that work alongside the P and K to promote even denser concentrations of flowers while encouraging the swelling of fruits. How PK Bulk Works: PK Bulk is a concentrated PK booster that is used alongside your base