fingers crossed
I use about 1000 uS/cm, and my roots are very alive. There is an adjustment period though if the plant came from a bark media.View attachment 48106Yes, and works but there are few things need to be careful about rockwool. My experience that rw can dry out fast but can take up a lot of water suddenly. Because of that salt cc can build up fast in the rw and because of that cc of outflowing water should be controlled regulary, i do that once per month. If it is higher than 500 uS/cm, i change to rain water, till outflow water drops down to 100 uS. I started with 400 uS fertilizer but i decreased it to 200 uS . Roots of one of my viet after 3 months in rw.
As you nicely point out it is not so much the exact number (µS/cm) that is decisive but what the solution is made up of. I always like to take such an opportunity to post the following blog article (I only refer to the first paragraph about the salt rinsing): https://www.paphs.de/en/culture/theory-und-practice-part-2I use about 1000 uS/cm, and my roots are very alive. There is an adjustment period though if the plant came from a bark media.
But the reading you get from that test is at least 50% diluted.
I changed my process to soaking for about an hour before making a reading.
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