I just went through my first 2 buckets of SeaChem out of curiosity. At a salinity of 1.025 I measured the Calcium to be 600ppm, Alk 10dkh, and Mg 1275. I used both Salifert test kits and Elos test kits and sort of averaged these amounts.

The Salt does take a long time to mix but I always like to have a 20 gal garbage can of ready to use saltwater so I always have a full week to let the new saltwater mix before I even use it.

While I've been using it I havent had to adjust the Calcium in my tank because the salt mix always shoots it right back up each time I do a water change. I've also experienced my sebae anemone spawning 4 times in the few months that I have been using this salt... although I dont think it was the salt to blame. Also, nothing has died while using it.

I use it
 

Use it in about 40 plus maintenance tanks of mine, almost all are premixed from the last visit.

Works great, requires little testing as it has great consistency, but does take a while to mix.

Used a lot of salts, and I like seachem b/c of price, avail, and consistency.

everytime calcium tested above 500 while alk around 5 to 6. what's wrong with this company anyway?

Been using it from the start and have great results.

But it does take a while to mix and clear, but I normally do it a day in advance anyway...

Wow. Lots of replies!

From the looks of things there's some pretty significant inconsistencies and several posts have confirmed the high Ca concern that seems to be getting blown off by Seachem.

I guess I'll go with Reef Crystals and add some Ca upon mixing.

What about Tropic marine pro ? Any good