cobshopgrow
Well-Known Member
more the oposite.It's because coco has a higher affinity at its cation exchange sites for Potassium and Sodium then for Magnesium and Calcium and running tap water alone through the medium will cause all of the Magnesium and Calcium that is associated with those cation exchange sites to be displaced by Potassium and Sodium.
Ca and Mg have a double positve charge and are therefore more atracted.
"If the cations of Ca, Mg, Na and K are all present in the solution at the same concentration, they will be adsorbed at different levels, with calcium and magnesium being adsorbed at double the rate as they both have a double-positive charge, while potassium and sodium have a single-positive charge (Ca++, Mg++, K+, Na+). "
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