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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.
Botanicare Pure Blend Pro Bloom 15 Gallon
House and Garden Algen Extract 500 ml (8/Cs)
Botanicare Cal-Mag Plus 15 Gallon
GH Armor Si 6 Gallon