Most of the time, I just give away whatever I have left when I call it a day. I had been told by multiple people that using salted minnows was illegal or that you had to use only certain kinds of salt, and by just as many others that it was legal and it didn't matter what kind of salt you used.
So to make sure I knew for sure, I called the ministry and asked about that. After speaking with an enforcement supervisor, Kelly, the gentleman I was speaking with told me this and I quote>>>"because nowhere in the regulations is this addressed or discussed, using salted minnows for personal use IS legal and you may use whatever kind of salt you wish to salt them. You may not however sell them and any frozen or salted minnows you have DO count towards your possession limit of 120 baitfish, regardless of whether you caught them or bought them."
When I salt them, I keep them alive in my minnow pail with the aerator until I get home. Then once here, I drain most of the water outside, leaving just enough to cover them. Then into the sink, throw the salt in, (sometimes with garlic) enough to make the water really cloudy, (a brine.) Doesn't take long for them to die, just a couple of minutes. Once they're dead, I let them sit in it for about 10 minutes, then drain the water. Let them sit for another 5 minutes, into the zip lock (while they're still wet) and into the freezer. They're re-freezable and reusable. I've had some that I used 5 times.
When it comes to live vs salted tho, I have found that I always catch more and bigger fish using live. I only salt early in the season because once minnows become readily available, or easily caught, why continue using salted when live works so much better, that and I like to support the local bait dealers where I get my minnows.