I am adding ppm of Stuff 1 2 3 4 7 times a week
and I'll change % of the water every day twice a week three times a week every week every two weeks every month

How much Stuff would I have every day for the next month three months six months year ?

Give me a fancy simple chart

Calculate for % ppm weekly uptake.
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I am starting with ppm Stuff after a waterchange
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Instead of my regular dose add ppm of Stuff at waterchange.
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My tap has ppm Stuff.
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I feed mg of food a week into my gal L tank. This food is % mg/kg Stuff.

Regress data into a best fit line instead.
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Give me CSV, too, foo.