Albert, if you take note of your original question that I was responding to, it makes no mention of water temperature of your water change water. It makes mention of the temp of the water WHILE MIXING.alrha said:is there any need to heat the water while mixing if it is going to be only a small percentage of the water (i.e. <5%)?
Once again, back to the original question, the salt will dissolve better in 78 degree water than at 65 degrees.
I don't heat up my topoff water either. It gets added to the sump, just as marrone said. I only heat up my saltwater mix because of the dissolving effect, no other reason. If it dissolved just as easily in colder water, I'd be doing that.