Glad to see some life and activity on SKFA.
Great tip - start it like you plan to run it.
Ever since I installed a rain tank and started using rain water for everything, a lot, and I mean a LOT of the usual issues to do with water has been eliminated, if not reduced to a manageable level. I totally recommend it. I have an RO filter that I don't ever use anymore.
While you have been setting up new tanks, I have gone the opposite way. Reduced my collection by 1 tank this Easter break. Still hanging onto the equipment, I don't know what for. But I have several empty tanks and associated equipment just piling up in the garage. I'll bite the bullet and get rid of them one day.