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Can someone critique my dwc bucket and ppm issue

So I’m using 5gal dwc buckets with nice air stones. Anyways seems to be working fine but am confused.

I use RO water that is about 15ppm. I’ve been strict with how I’ve been doing the gh flora trio. Anyways the mix always comes out to around 600-700ppm including 2ml per gal of calimag.

Do I then just add RO until it gets down to let’s say 200ppm then put in new nutes. And also should I just add RO WITHOUT calmag or do I always add calmag?

Trying to figure out how to make this perfect...

Can someone critique my dwc bucket and ppm issue

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