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.

 

[green_frogspawn]

no i wouldnt be using pool salt at all, doesnt have the right elements in it

 

[Reefsystem]

ok ill just stick with natural sea water