While not using an MBBR, we ...

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While not using an MBBR, we have both nitrified and denitrified in water with salinities that you described. The nitrifiers at 30+ ppt are from different species than the typically described  Nitrosomonas  & Nitrobacter . The denitrification species tend to favor the more halotolerant versions of standard WWT organisms. As long as salinity is consistent, the system should naturally adjust well in your range. Our big problems have happened when we cross the 45 ppt threshold.