Water changing station help

[lacrosseboss18]

I'm gonna build a water station changing station with the Ace roto mold containers.
Looking for opinions. Will be for a 225g display.

I'm thinking of getting 2 containers each 100gallons. One salt and one fresh rodi
Or
100gallon for rodi and a second for salt water. It sure of the size. Was thinking smaller so that extra waters not just sitting in the container. Maybe enough for the water change.

What do other people do. I see people with these 2 large containers and what do you do with the premixed saltwater after you do a water change. Does it just sit in the container? Is it ok to heat the water up and then cool it down?

What would my best option be?

I like the idea of always having salt water on hand just in case of an emergency or whatever.
Thanks

 

[Pongo]

There is a lot of good info in this thread.