The FoxFarm Bushdoctor Wholly Mackerel 30mL is a highly concentrated liquid additive specifically designed for hydroponic systems. Made by FoxFarm, this organic supplement comes in a convenient bottle packaging and is compatible with all purpose plant types. With a volume of 30mL, this concentrate is perfect for adding to your hydroponic setup to promote healthy growth and vibrant blooms. Whether you're a seasoned gardener or a beginner in the world of hydroponics, this product can help enhance the nutrient content of your plants and improve overall plant health.