
I keep my saltwater in 5 gallon jugs for 3-4 weeks at a time never had a problem
The concern should be how clean your storage system is. RODI is clean almost no chance of bacteria and other stuff but if you mix them in the 5G saltwater bucket and then use it to store, most likely the water is already contaminated. especially, the changing season, where tons of crazy organics/good or bad living organisms are air born. Therefore, I always circulated the stored mixed saltwater 2 days ahead of usage.
