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do i still need to dose k2so4 when i'm dosing kh2po4 and kno3 with ei dosing?

and if so what is the amount? is it the same amount as kh2po4?
If you are one of the few who have considerable nitrates in the tap water, and a big fish load, you might want to dose less than the EI recommended dosage of KNO3. But, that could leave you short of potassium, so then you would dose K2SO4 to make up for that shortfall. Most of us who follow the EI method don't need to dose K2SO4 at all. The normal dosage of KNO3 contains plenty of potassium for the plants.
 
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