Can Hard red sea salt be used?

[Evolutionz]

I was given a pack of red sea salt but they appears to be rock hard.. i had to use a screwdriver and jab it multiple times to break them apart, before i dump them into my 34L tank and cycle with a 600l/hr pump.. even after 24hours, there's still some salt on the tank base.. refractometer reads 1.024.. is the salt ok?

[vtecintegra]

I have reef crystals that is like that. I mixed and tested, and the alkalinity was very low. If you use, I would test alk. Probably best to discard though.

[Evolutionz]

thanks for ur advice, already thrown away and bought red sea coral pro salt already