This is what I’ve been using
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Yes, if you read @pigSquishy’s comment above, apparently this stone, if not rinsed out/washed properly before use, it contains lots of dust that is actually like soda lime, and this will continue to create an alkali situation in your reservoir, driving your pH up. This is probably causing the high pH like nutrient deficiencies/nutrient lockout everyone is concerned about.
~MacG
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So what should I do? I went to the rocks off twice before using. How can I correct it? Here a few recent pictures
.the 2nd pic are the leaves coloring supposed to look like that or is it showing me it needs somethg
The only thing I can imagine you could do is empty the reservoir, especially if you are having the rising pH issues from the remaining lime contained in the rocks as described above by @pigSquishy.
Maybe try flushing 5.8 pH’ed water through the top of the stones as you obviously can’t wash the stones as the plants are already growing in them.
Replace the reservoir with a properly 5.8 pH’ed new mix of nutrients and water, and be diligent and keep an eye on the pH and make sure it stays at 5.8pH.
You may have to repeat the complete nutrient change and flushing the rocks from the top, maybe even very often until the end of this grow, especially if you are continuing to have a rising pH.
And then in the future maybe do as pigSquishy has done before using new rocks, be very diligent in your washing and rinsing of the new rocks before use.
And you should be able to re-use these rocks as well for the next grow after thoroughly washing them and maybe soaking them with a root enzyme to get all the old roots out, this process should also get any last bits of the lime out of the rock’s pores for the next use.
~MacG
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OK thank you
Thank you , I didn’t read that (this on me) I was told from the guy in the store to just rinse them off.
Thank you that was well needed info…
I changed the reservoir nd the water once a weeknd. What else can I do