Agree with you oshkosh.
I started off with a 24'', 18", 18". Was really a pain bringing water back from the beach - putting sea water into 1.5ltr pet bottles, carrying a bunch of them back to the car, taking the lift up to my HDB flat, pouring the water in a pail, wait for the dirt to settle, inspect the water for odd objects, then finally pouring it in the tank,
Next week, same drill.
Buying salt saves a lot of time and effort.