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This blend of organic acids lowers your nutrient solution's pH. It's our pH down. Don't worry if you over shoot the down: just add some Olympus Up and see the benefits of adding more calcium.
Plant Success Orca Liquid Mycorrhizae Quart (6/Cs)
Pegasus Potion Quart (12/Cs)
Herculean Harvest 5 Gallon
Medusa's Magic 5 Gallon