Can anyone tell me if these " White Spots " are bad ?

[Tyler777]

Ok

How bout this one ?

 

[Colin_T]

That one will raise the pH of your water.

Just look for salt that contains sodium chloride and nothing else.

I use swimming pool salt and you can buy bags of it from hardware stores, shops that sell stuff for swimming pools and even some chain stores like Target. Alternatively look in the salt section at a supermarket and find rock salt.