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Comment on Rockwool vs. Perlite vs. Hydroton vs. Soilparent

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Do you have any suggestions or DIY ways to get the nutritional values? I'd be glad to take them to a lab or ship them as long as it wasn't crazy expensive. I noted what nutrients I used ( Maxigrow veg ) but I have no idea how to get the nutritional values (such as vitamins).

Unfortunately, not personally. I wish there was a testing service as I use Lapka (https://mylapka.com/), but it doesn't give much. I've always wanted to test different vendors at the farmers' market and compare to Whole Foods and others.

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