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Hello all,
I have been in the saltwater hobby for 20+ years now, and in the middle of setting up my very first planted freshwater tank.

What I'd like to know is, can I use my water I make from my RO/DI unit in my soon to be planted 90g?

Or will the water be striped of needed items from the ro/di?

My setup is a seven stage ro/di unit, so the output is 100% pure h2o.
 

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I use 100% Ro for my planted tank. Never had any issues. I used to do 100% RO/DI but got tired of remineralizing it.
I am guessing you have a smaller tank with an active substrate. Also dosing EI with gh booster will help, but I guess you will quickly deplete your active substrate. On a large tank you will have issues if you use only ro/di unless you dose gh booster and some sort of k2co3 to increase your kh (clearly this is dependent on the substrate)


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i use 100% RO water, gh 1-2 and Kh 0, plants and fish were happy and healthy, i dosed my own fertilizer on this setup. 1tsp of GH booster during water change.
 
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