salt for a 20000l reef pool

[Reefsystem]

I want to make a large reef pool in my backyard where it will receive full sun and will be open to the elements.
My only concern is water changes.

Could I use pool salt and mix it with RO/DI , to make my
water changes.

 

[zens]

you'll need to use commercial marine salt just as you would in a smaller setup. pool salt would be a bad idea

 

[coralite]

You might consider making your own salt mix since you will need so much but pool salt is not the main ingredient. Do a search for aquaculture and making saltwater.