Hi All,

I've been googling like crazy and I can't find a clear answer on this. I'm an experienced soil grower of many years, but I've just upgraded my system to a DWC Hydro system (home made storage tote) and I've just started my first grow.

I'm using the lucas formula (standard GH Flora) with Floralicious plus, CalMag and Cannazyme additives. I'm using the "add back" calculator method to top up my reservoir weekly with additional nutes to maintain my PPM (No reservoir dumps/changes, just topped with plain water during the week and one nute "add back" once per week). I know lucas himself does not recommend using additives, but I've had good luck in the past during my soil grows so I would like to continue my trend. Additionally, I've found out the hard way that I *MUST* use CalMag with my water to avoid deficiencies.

My question:
- I'm wondering what rate extra Floralicious plus and extra CalMag should be added to a DWC reservoir during my nutrient "add back" top up every week?

Assuming that my initial reservoir is filled with full strength nutrients and additives, my gut tells me that adding additional new, full strenth doses of floralicious plus and CalMag every single week on top of the existing nutes in my reservoir would be a bad idea, possibly building up to toxic levels?

My best guess right now is to equate the Floralicious plus and CalMag dosages to the Lucas formula ratio. I'd love to hear your thoughts:

For example, the floralicious directions instruct you to add 1ml per gallon when mixing a fresh reservoir. The CalMag directions say to add 5ml per gallon when mixing a fresh reservoir. So, I figure if I'm running the 0-8-16 strength Lucas formula, for every 8mls of micro and 16mls of bloom that I'm required to add back to maintain my target PPM (or in other words, for every "gallons worth" of full strength mixed Lucas formula mixture), I should also add 1ml of floralicious plus and 5ml of Calmag?

My reasoning is that this would be the same "ratio" of nute strength when mixing a fresh reseroir.


I'm really not sure so I'm hoping someone with experience with the Lucas Formula, DWC and these nutes might be able to guide me. I would really hate for something in the floralicious or CalMag to build up to a toxic level, or just as bad to be missing out on its full potential. What do you guys think?

Also, on a side note, the cannazym instructions state that if reusing the growth media (which I assumes applies to DWC without reservoir changes) to double the weekly dosage. Makes sense to me, but since I'm already making this post I figure I'll check if this sounds right to you guys?

Cheers!
dunumptanum Reviewed by dunumptanum on . Lucas formula - addback method and additive products (Floralicious plus/CalMag)????? Hi All, I've been googling like crazy and I can't find a clear answer on this. I'm an experienced soil grower of many years, but I've just upgraded my system to a DWC Hydro system (home made storage tote) and I've just started my first grow. I'm using the lucas formula (standard GH Flora) with Floralicious plus, CalMag and Cannazyme additives. I'm using the "add back" calculator method to top up my reservoir weekly with additional nutes to maintain my PPM (No reservoir dumps/changes, just Rating: 5