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Im in soil but Have a water question

Hydroponics / Aeroponics
Im in soil but Have a water question
Like the title says I grow in soil
But i figured this would be a good place for this question.

In my room I have a water holding tank.
I use a float valve to auto refill
And of coarse a hose for delivering the water.
It also has an air stone in it

I have decided to use an ro filter
Because I need to have very low ppm
For what im doing and my current ism filter is not getting me there.

My question is about cal mag.
Is it possible to just continually add
Calmag to that barrel to my...

Im in soil but Have a water question

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