Yea that’s what I’m worried about, my water tanks are hard plumbed into my system. They are verticals tanks and I would rather refrain from cleaning them as well as my pump. By paying extra I’ve been able to avoid the build up. I just wonder if I can get the same result from other salts. I’ve used Red Sea blue bucket in the past and the brown build up does occur over time. That was when I had a brute can and was easy to clean!I was recently started using Red Sea, It mixes fairly quickly and is pretty clean. I used to use Instant Ocean and before that Reef Crystals and both of them left a certain amount of crud. I think Red Sea might leave a very small amount of brown film on the container in a few places but I am not really sure (it might be from left over crud from IO). The other thing I like is the two bags I have run are spot on for parameters (IO could be really off which is why I switched).