filling

Hi all, I'm starting out in the hobby (but with a 15 year history with fresh water tanks) and need to fill my new 625L/165G system next week. My RO system will create around 150L a day. So it will take me some 5 days to create enough fresh water. First I'll start with the sand and rocks. Then...

I am about to set up a 75 gallon. I don’t have a rodi unit. How would you fill it? Get rodi from my LFS? It’s about 25 minutes away. What would be the fastest way. TIA