Lucas Formula Add back Questions

Hello Fellow RIU Member's.

I have been looking into Lucas Formula and stumbled post on the add back formula,

Here is the add back formula
((target - current) / target) * ml per gallon * res gallons = (ml) of the nutrient
(Of the nutrient)

So I was thinking why can't the add back work for flora series
so lets say i'm on week 3 of veg LATE GROWTH The PPM should be around 1100-1300ppm
That's 10 ml of grow, 10 ml of micro, 5 ml of bloom, 2.5ml of rapid start, 1ml of Floralicious Plus.
and my rez drop 2 gallons (10 gallon rez is now at 8 ) and ppm at 900


((target - current) / target) * ml per gallon * res gallons = (ml) of nutrient


((1300- 900) / 1300) * ml per gallon * res gallons = (ml) of nutrient
(400) / 1300)
(.30) * ml per gallon * res gallons = (ml) of nutrient

.30 * 10ml per gallon * 10 res gallons = 30(ml) of grow
.30 * 10ml per gallon * 10 res gallons = 30(ml) of micro
.30 * 5ml per gallon * 10 res gallons = 15(ml) of bloom
.30 * 2.5ml per gallon * 10 res gallons = 7.5(ml) of rapid start
.30 * 1ml per gallon * 10 res gallons = 3(ml) of Floralicous Plus

Put all that in 2gallons of ph'ed water and add to the rez, Will that work or am i missing something with the math?


let me know what you guys think

Thanks guys

Lucas formula doesnt use grow pretty sure... atleast i dont. If i add 20gal to my rez than i top off with 20galworth of nutes as per the formula. My ppm always goes back to where it started when initially filled.

ricky6991 said:

Lucas formula doesnt use grow pretty sure... atleast i dont. If i add 20gal to my rez than i top off with 20galworth of nutes as per the formula. My ppm always goes back to where it started when initially filled.

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YES ur are right Lucas formula doesn't use grow.... Im talking about adopting the add back formula and using it on the flora series witch does use grow.... Please fully read my post.
I do know my grammar and spelling might be little rough. But you completly missed the whole part where i was talking about flora series (Not to be rude but..)

Cheers Sfrjosh

most who use flora dont use the grow , its not really needed. the micro and bloom combo has enough N

ricky6991 said:

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Dude go smoke one.... I think its rude to come in here and avoid the whole question....

Not trying to be rude. but u honestly didn't read my post, or u would realize that im asking about the add back formula not ur experience running 0-8-16.
I was asking if i can use the same add back formula but instead of using 1330 i use the flora program ppm for that week and plug in each nutis ML instead of just fig out micro and double it for bloom.

thanks again
go ahead think i'm rude.

any one else?