[OGD] Re: Salt Absorption

[IrisCohen]

I don't know about diatomite, but I have read that charcoal ADSORBS excess salts. In the size particles we use in orchid media, the charcoal holds onto the excess salts for two years, after which it reaches its capacity & the salts are released into the medium. That is one reason to repot your orchids every two years.
Iris

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