~TEST-
I took my standard weekly Veg nutrients~ blended them together with water into two nourishing test drinks, and left to sit on shelf to observe changes.
I set up this little test in light of some excellent comments on PH from Vlad and Tead, on Lexort's journal.
These two concoctions are composed of the same stuff I've been dumping on the veg room crowd for the last few weeks.
One has silica, one doesn't.
I added, per gallon, Botanicare-
CalMag+. @ (100 ppm)
Grow. @ 10ml
Liquid Karma @ 2ml
Silica Blast. @5ml
(and)
PH Plus
PH minus
The ph+ and Ph- were added in order to adjust the glop into ph 5.8 range. Also they were added in order to ensure that all the usual nute suspects were included in the mix. I ended up landing at a bit higher ppm than I normally give the veg plants, but that's ok.
Yes everything is very dirty. Sorry! My robot maid is malfunctioning again, unfortunately.
The plan is to keep an eye on the ph and ppm of the two batches and see what they do over the next week or two.
I'm testing PH to see how it changes. This may/should tell me what PH swing is transpiring inside the containers of my vegging plants.
The other part to this is- I want to see how mixed nutes spoil over time, if they do. If there is a reaction between the different chemicals I put in there, specifically a reaction causing something or other to precipitate out of the solution, then there would be a drop in ppm I assume, so hence the ppm tests.
Maybe there's some other way that the nutes and ph+/- could react with each other to spoil that batch. I don't know what, because-well, there are lots and lots of things I don't know.
The experiment may help show me whether or not my mixed nute solution can be left to sit for a period, or not, as well as hopefully observing a suspected ph creep. The creep is suspected of having poisoned my innocent plants with high levels of base making them turn purple and lose energy.
In life though, as you know, there are times when you have to deal with a little creep. I am hoping I can make the creep work for me.
As Tead pointed out, it may be wise for me to ph my nute solution lower than I have been, to about 5.5, if as I suspect, the creep has been at work raising the ph throughout the week. I'm hoping to see the ph of the solution range upward throughout the week ( during most of which I won't be here to test it
). I'm hoping that this creep will turn out to be slow and gentle. I'm also curious if the silica has any influence. Maybe we will find that there is no creep.
They are much improved and starting to grow fast again. Mama Thai is still straggling, shaking off the flu but definitely on the mend. 
