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Dear Smoggycb
I would guess that 19,47 mS is 19,47 mS/m (?) which is the equivalent of about 6800 mg Cl/l. If so, than 4.5 mS/m is the equivalent of about 1500 mg Cl/l. This is very high for O. ornata. I didn't even know that this species is able to survive such a high conductivity and even such fluctuation. In such high conductivity the conductivity is mostly caused by chlorine, instead of other ions.