HELP! my second grow with the PPK system is somewhat of a fail most likely due to my inexperience and i'm hoping you guys can help me fix my issue (pH keeps drifting too high in the system)
My first grow was almost perfect for a first-time grower; my pH and PPM was stable throughout the grow and i was rewarded with a one pound yield off of one plant!
This second go-around though, i experienced high pH which resulted in excessive purpling at the top of the canopy. After harvesting the plant last night i now realize that the top parts of the canopy that was exposed to the most light got the most purpling. Not sure if that indicates a specific toxicity, deficiency, or a combination of things? Here is a picture of the purpling plant right before i chopped it down last night:
I chopped it down because under a microscope i was at about 15% bright yellow trichomes even though i had a lot of clear ones. Yellow not amber. I have no idea why they are yellow unless they are CBN? Also, the purpling has gotten to the point where the nugs themselves are purple and im not sure if thats a bad thing but it looks abnormal to me. I was afraid if i kept delaying harvest i would end up with too many degraded trichomes and possibly a bad smoke.
I was not able to bring the pH down to a satisfactory range in my attempt about two weeks ago.
I had drained MOST the water out the system (except for the one PPK site that was being used because the plant was weaved into a SCROG screen so i couldnt lift the top bucket up). I then cleaned all the buckets using hydrogen peroxide. There was gunk stuck to the walls of my buckets and pump so I cleaned all the gunk off the inside walls and floors of the buckets
After cleaning my buckets, i now find out two weeks later that pH has again drifted up to 7.0 :( So I'm baffled.
pH at elevated reservoir is 5.8
pH at Control bucket is 6.2
pH at PPK buckets range from 6.8 to 7.0
I also noticed this morning that there appears to be some kind of build-up at one of the elbow tees. Here is a picture of that:
Is it possible there is salt build-up in my plumbing skewing pH? Or some other kind of build-up (like mold, algae, or fungus) in my lines causing pH to spike possibly?
FYI, i use to use silica as an additive but have stopped since noticing the pH is drifting up to 7.0 pH and since cleaning the buckets. Is it possible remnants of silica are still in my lines causing pH to spike??