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.