I have a customer new install. Pool is almost full we just need 1 or 2 thousand gallons more. I suggested the poly fill bucket method and he didn’t seem to keen on that and said he has a hose spigot in his garage that is treated through a water softener system to wash his cars. I also have been using a product called ReVive which is supposed to capture iron and copper up to 2 ppm. It has helped tremendously for new installs as far as concrete and keeping it from scaling. I’m just not sure about how it”ReVive” actually captures iron or copper. Our water delivery guy brings 5000 gallons at a time I’m trying to save him and us some money.