Well I must give credit where credit is due.....I overheard a sales guy at Big Als telling a customer this the other day and it actualy made sense....
he said to do water changes with tap water and just use RO for topups.....this was for a larger tank for sure but his argument was that yes you would gain some minerals etc frrom your water change but at least by toping up with RO the minerals weren't building up in the system....
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