No maths. I use my e.c meter to get it back to the level the plants were happiest.
Top up with water
Add nutrients a bit at a time till I hit my ppm requirement.
Adjust pH by adding a few drops of up/down at a time till in range.
Jobs done.
My f*ck ups in my grows usually come down to my laziness not cleaning and reconfiguring my pH meter as often as I really should.
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