Wish I could help.  The only thing that's change for me in the past 20 years is that I added a powerhead and hose to pump the new saltwater in to my sump.  Other than that, it's 5g buckets all the way.  I only do 10g water changes so it's not that big of a deal and I consider it exercise.  I'm bumping this in case anyone else has additional info. 
My favorite water change system is owned by 
@jessezm   Basically, he has a large aquarium plumbed into his whole system that is noting but water.  When he does a water change, he closes the line to the aquarium (50g?), drains it, adds fresh saltwater and opens the line back up.  It's a whole big aquarium just for water changes, it's pretty cool and takes him around 10 minutes to complete.