Interesting it mixes dirty, being synthetic/lab grade I would have guessed it didn’t leave a residue or as much as blue bucket for example. I wonder if it used the same caking agent or at least that’s how it was explained to me about the residue from blue bucket. I’m really debating going back to IO. Difference this time is I’m storing it. Where as the 20 years I used Io I always mixed and used it with in 24 hours.
It leaves a brown residue and will have scale build up over time. I'm not sure of the cause of the residue but I think I remember @Randy Holmes-Farley saying something about clay but my memory is bad. I read that he is using IO on his 1% per day AWC system.
