So it takes very little protekt to fix pH? Sorry, I wasn't sure about that. I've never used DG myself, I just noticed a lot of people say they bring up the pH up with protekt, but figured they needed a lot, thus changing the NPK profile of the final mix.
An alternative to protekt for adding K without anything else would be potassium hydroxide (pH up), but I guess that's sort of moot point.
I agree it doesn't make sense to add more than needed to pH balance it, it was just a thought. Sorry, kinda high! I figured if the pH is low and it needs lots of pH up, 9-3-6 isn't the final NPK once the pH up is added. If people need to add lots of K2SIO3 to pH balance, it brings K higher in the final NPK.
As a side note, for my homebrew mixes, I use potassium nitrate (KNO3) as my main source of K that doesn't also contain P. It has an NPK of 13-0-44 as a dry salt. It's probably not worth adding to DG as a test though.
While I think it would have been safe for DG to add more K to their 9-3-6 formula, I don't know that the plants would see any benefit. I say this because I use very little protekt to balance the pH of my Foliage Pro in RO and I have yet to see a deficiency of any kind, let alone a K deficiency. I know that once we've met the nutritional needs of our plants, adding more of any of the elements provides no extra benefit. If you know of a way to add more K without adding a lot of P, I'd be interested in running a test.
