Bad batch of Instant Ocean

[Megalodon]

It's a 50 gallon tank with 30 gallons in the sumps.

Yeah, in hindsight I should have tested the alkalinity first before adding to the tank. The temperature and salinity is the only thing I thought to test. I had no idea it was normal for the alk to vary a little from batch to batch. But this is EXTREME.

Should we start mixing up our salt before using it?

Thanks everybody for your help!