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I wountl want to know if the Thomas Korallenbruch für Kalkreaktor 15-30mm is really phosfate free and the corect Ph level on reactor
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Edulus, it is a natural material which contains a low PO4 quantity, I would say it has the lowest PO4 concentration of all the natural coral gravels I have used in the past. Before I add the gravel to the reactor, I rinse it about 2 or 3 days with RO water. The RO water is changed twice a day. After this procedure the gravel is PO4 poor and already at the next day, the water which comes from the reactor has the same PO4 reading as the tank itself.
I have never checked the PH of my reactor, I use the KH level in the tank to adjust the CO2 quantity.
G.Alexander
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