So i saw the question about RODI and it got me thinking about saltwater. I personally buy mine from the LFS since i have tested their water and it is good with all the parameters. Personally i was told that the water can last a few months...and have used water that i had for atleast a couple of months no problem. Usually i smell it to see if it smells ok...thats my test LOL I know mixing is probably cheaper...but please lets not debate mixed versus store bought. So how long can i keep store bought Saltwater in an air tight container kept in a dark air conditioned closet? Is it the same for those that mix their own? Thanks!