What specific parameters are you referring to? I don't have a comparison to use for dKH since tank is new. Live sand & cured rock was transferred from another tank. Have not had any ammonia or nitrites issues.

Do you know what the dKH was before you opened and started this pail?

I have also experienced the Alk level inconsistancy with Ocean Pure Pro.

No - I started the tank with this brand.

Well then I would say if you are comfortable finishing the pail you have, that you should make a different choice next time.

Not sure if this is the issue, but there's a problem with a bunch of different batches of Salifert ALK tests giving artificially high results. There's a thread in the Salifert forum on RC that lists the affected lots.

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I use OPP and find that my ALK levels are too low, around 7 dkh, at least with this bucket. Mg is very high though which might affect the reading for the other levels. I usually dose ALK anyway so I've never worried about it.

It seems that no salt is perfect right? You will always have to dose for something. So far with the OPP the mag and cal is higher than IO and it seems to mix better. If all I gotta do is dose for Alk that's not so bad. That's just my opinion so far. But I haven't been through that many buckets of salt yet.