RO/DI water?

[Crow]

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.

[fplata]

You will need to remineralize it, what is your tap water like? In my case I use 70% ro/di 30% well water and that gives me a ph of 7, gh of 5 and kh of 3. Lots of people use tap depending where they are from.


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[jmowbray]

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.

[fplata]

Originally Posted by jmowbray

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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[Crow]

So it's best to just use tap water with an dechlorinator?

[fplata]

Yes, or a mixture depending on your tap parameters.


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[Crow]

Surprisingly Detroit city water is some of the best water in the US.

Thanks for the answers.

[happi]

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.