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Advanced Nutrients Hammerhead is the modern version of the old PK type flowering booster which has been optimized for indoor use. Highly Recommended.

Designed by a team of top scientists dedicated to making products of excellence
Manufactured to the highest possible standards by Advanced Nutrients
A flowering booster which has been optimized for indoor gardens
Creates bigger and heavier blooms of superior quality
Perfect for use with the range of Advanced Nutrients additives and boosters