Topping off the res with 33% vs 100% solution

RCJR

Active Member
I do a Rdwc res change every 7 days. Do you recommend topping off the res (when the water level drops, ruffly every 2 days) with a 33% (of the starting ec) or a 100% (of the starting ec) nute solution? Say the starting ec is 2ec of a fresh res change. Top off the res though the week with 2 ec or a .66 ec solution?
 

Wastei

Well-Known Member
I do a Rdwc res change every 7 days. Do you recommend topping off the res (when the water level drops, ruffly every 2 days) with a 33% (of the starting ec) or a 100% (of the starting ec) nute solution? Say the starting ec is 2ec of a fresh res change. Top off the res though the week with 2 ec or a .66 ec solution?
It all depends on the reservoir size, plant count and stage of growth. Doesn't really matter what you do. You aim for desired EC value, how you reach that point doesn't matter.

You could have one container with full strength and one with RO. Or you mix 1/5th strength etc. If you run bottled nutrient you could even add it straight to the reservoir(especially one part solutions).

You dial this in depending on the factors stated above. I don't think you need another thread regarding this right? Good luck! Cheers!
 

Slyclyde1991

Active Member
Check the EC before you add anything, if its higher than what you started with then do a reduced EC top up, if it's the same or close to it, then do the full nute top up
 
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