Shaded_One
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Seems like Biobizz assumes everyone uses tap water for their grows?
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However, in some cases the base pH of the tap water can be too high or the grower chooses to use RO water with a very low pH. In those cases, you can use Bio·Up and Bio·Down to regulate the pH of the mix before watering your plants.
Calmag - Biobizz
www.biobizz.com
More from their website...
Is it necessary to regulate the pH when using the Biobizz products?
In general, when using organic nutrients, pH adjusting is not necessary. This is because the Biobizz products tend to lower the pH naturally until it comes to the optimal range of 6.2-6.3.However, in some cases the base pH of the tap water can be too high or the grower chooses to use RO water with a very low pH. In those cases, you can use Bio·Up and Bio·Down to regulate the pH of the mix before watering your plants.