How to automatic mixing water

[Lance]

Originally Posted by lastlight

So do you guys think it's ok to have a 200g reservoir of ready-to-go saltwater on hand? Let's say it gets fully used up in a month...

IMHO, The saltwater should stay fine for quite a while providing it has some movement via PH and that it is stored in the proper container and cannot absorb anything harmful from the air of the room it is stored in.