Why not to use io salt
 

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All sps, half my lps, and almost all my inverts including my giant abalone, bristle worms, snails, conches, etc

Was this the salt from the pet smart deal?

Holee crap

I had a bucket from KEs recently that must have been the dregs from their hoppers.
The big 3 tested off the charts through the whole bucket.
12.5
420
1650

Maybe you had an Alk spike ?

Holy crap! That's devastating. What salt were you using before?

Alk spike shouldn't kill my snails

Oi! That's terrible! How did you come to the conclusion the salt did it? I'm not doubting you, I'm just wondering what exactly happened.

Io salt
 

Why was it the salt? You've been in this hobby along time so what happened man?

Did a water change, woke up to dead stuff

New bucket? I assume you checked all the other stuff like temperature and dosers functioning properly.

It's very seldom u hear some thing that drastic happens from using a bad batch of salt. Usually it's the more sensitive species that go first then if that triggers s mass die off it would still take more than just overnight. I have once changed my water with 40 gallons of fresh wartet not realizing until after that it was fresh, the salinity dropped a few points but luckily my tank volume compensated for it and everything pulled through. I am not saying that's what happened to you but who knows. I have always used io and knock on wood, I have never had any issues.

Sorry about your loses bud, No matter what it's still hard. I'll have some frags for you in a little bit.