Hello all, did anyone notice adverse effects on more sensitive plants using calcium sulfate hemihydrate CaSO4.1/2H2O to remineralize RO? It seems to be more aggresive than regular calcium sulfate CaSO4.2H2O. mine don't like it.
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Calcium sulfate hemihydrate CaSO4.1/2H2O
- Thread starter Martien
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What are you noticing?
There really shouldn't be any difference at all. Essentially one has 1/2 less water in it's crystal form. There would really be no difference in effects between 2H2O and 1/2H2O.
Where did you get it from?
There really shouldn't be any difference at all. Essentially one has 1/2 less water in it's crystal form. There would really be no difference in effects between 2H2O and 1/2H2O.
Where did you get it from?
- Thread starter
- #3
Got it from a builder's supplier, cheap stuff. The ingredients said just CaSO4.1/2H2O, but you never know. I do know it dissolves much better than CaSO4.2H20, not leaving that white haze for hours. It is crystal clear after 30 minutes. I wonder if it could burn the leaves.
Actually, I think I might be wrong about this. Looking into it more, the Hemihydrate does appear to react faster (not dissolve, react).
The hemihydrate reacts with water to form gypsum crystals.
Forms particles/cloudiness, settles as a powder layer, etc.
Apparently it's not recommended for aquarium use compared to regular gypsum.
Personally I use Gypsum in all of my tanks to reach 25-30ppm Ca, always.
The hemihydrate reacts with water to form gypsum crystals.
Forms particles/cloudiness, settles as a powder layer, etc.
Apparently it's not recommended for aquarium use compared to regular gypsum.
Personally I use Gypsum in all of my tanks to reach 25-30ppm Ca, always.
Have used CaSO4 Anhydrous & Gypsum both at different times as long as the Ca is maintained at whatever level you want to set it to it shouldn't really be an issue
