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been using it ... for near half a year
Basically the concerns mentioned that i have tested.
pH - upon dropping into water, pH will increase to 7.4 temporary (depends on concentration of mineral and water)
acidic soil will buffer back to 6ish within couple hrs.. luckily
gH - it has calcium oxide , so will give 3-4 gH on a bare tank effectively
it is powdery and not actually a rock .. more like mineral powder compressed into a shape form.
* will advise to underdose the rocks as each rock is different sizes, long term of use release calcium oxide into water which required constant water change to keep up with suitable gH
Originally Posted by darter
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