Ph Rate of change formula

X1= Gals liquid in system
X2= gals liquid being introduced
Y1= current ph in system
Y2= ph being introduced to the system
Z1= rate of change


Y3/x3= z1

(Z1 * x2) +/- y1 = adjusted ph of the entire system if x1 & x2 are combined


Way too early in the morning for algebraic equations lol


You would - if your formula change is to reduce your levels

You would + if your formula change is to add to current levels


Add a sticky to it @dbrn32 and we’ll let people use it for future reference

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My brain hurts now… time to smoke some more lol thanks!


Well we could always just toss some ph down in and cross our fingers as usual :rofl:

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You been spying on me :flushed::wink: lol it was a learning curve but now that I’ve done it a million times I usually can nail it first try without bouncing back an forth between up and down and ending up with 2500 ppms lol…


Need @latewood to do that.

That’s what lead to this! Can’t stand bouncing one way then the other, why not just have a practical formula to quickly adjust your rates by.

The same formula can be used to adjust nutrients in your solution also and if you’d like then account for the slope between ph and nutrients to know what that swing would be

I’m smoking what you’re growing and I am liking it. Just too stupid to apply mathematics lol


Yea my brother told me to smoke more and think less :blush:

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No!! We need the thinkers like yourself to guide us with logic and reasoning lol

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Where did this formula come from? pH is a logarithmic function and this is not a logarithmic equation. Depending on how buffered your water is can have a significant effect on pH.

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Used r/o water. Guess I didn’t take in account for anyone using anything else

Formula is rate of change

What it doesn’t account for is rate of reaction

Mols in water being used by others, just mine

Mols in solution being added to

I think i hear the maths section of my brain groaning under stress already

I had called in my brother and we wrote it out over zoom meetings for a week or two messing with it just going insane

Either one of us making the rabbit hole that much deeper by tossing in another piece of the puzzle

It all started because I hated when adding nutrients to the reservoir you never knew what would happen to the ph of everything when you combined the two.

Months of figuring but final conclusion came down to:

if you don’t know what is left inside the reservoir and totes that the plants haven’t used you’ll never know how it can react to what your adding to it.

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Found it… one of the nerdiest math things i have attempted…not particularly sure if i even got it right but it is acting about how i expected

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