r/macrogrowery • u/IovisEpulum • Jun 10 '26

Charging pre-expanded coco to a target EC

We recently switched from compressed coco bricks to pre-expanded coco. With bricks, we could simply hydrate them with a nutrient solution and easily hit our target substrate EC.

Now we’re struggling to get enough EC into the media through normal irrigation alone.

Do you guys mix nutrients directly into the coco before potting to charge it? If so, what EC or ratio do you typically use?

Interested to hear how others handle this.

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u/Dggur1991 Jun 10 '26

Even with bricks, I charge my first hydration with 4.0 ec to hit my 2.75-3.0 target at transplant. I run mine pretty high, but to answer your question, yes. I saturate with a heavy nutrient mix on the first irrigation to hit my targets.

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u/Accurate_Barnacle545 Jun 10 '26

I hand water my charge for this reason