In ProMix, for example, the peat is the part that is most acidic. Now, if your tap water reads over 7.0 but has very low ionic strength and EC, that means there's not really a lot of stuff in it to react, and it will be influenced MORE by that peat, just like RO water is, than say a tap water that reads over 7.0 and has a lot of carbonate ion in it.
stinkyattic Reviewed by stinkyattic on . Medium ph vs nutrient ph?????? For some reason I'm having a problem understanding this relationship. When you take promix, or coco and check the ph they come out 5.6 to 6.0. That's measuring by taking a cup of medium, filling with water (tap water at 8.0) and let set for an hour. Drain off and stick ph meter in. Based on this, what is the use of measuring medium ph? If one hand waters with 6.5 nutrient solution the runoff will most certainly be lower than 6.5. I guess I'm trying to understand if the ph of the Rating: 5