I was thinking it's pretty nasty... I should try mixing it without the heater to see what difference it makes but I like having my SW at tank temp that way it's ready to go in on a moment's notice and if I have to swap out a lot it's not like there's any kind of temp differential. I can swap out 30g out of my 75g and not even have my more senstive acros slime up (the ones that'll slime if I so much as have my hand in the tank too close to them for too long).
I suppose if it's mixing up with an alk >4.0 then it's probably better to let it precip out rather than risk having it precip in the tank (or worse, put things through an alk shock).
So far other than the messy mixing equipment the water hasn't given me any issues once it's in the tanks. Luckily I like to let the water age/stabilize before use, if I was dropping in 40% of unstable water into a tank I'd hate to become another one of those "IO statistics from last year" (although it's neither "last year" nor "IO" ... well .. I know Kent is IO but with "more stuff" .... hmmm, maybe I AM an IO statistic).
