Reefers best salt
I've been using reefers best, and haven't had an issue. I currently do not have sensitive corals, but I was at one time using the full zeovit system. It is true, in a sense, that running low alk with zeovit is better than being higher, but I was not aware of them changing the alk in the batches to 9-10? I'm not really sure what issues there are with precipitation..... If someone could explain, that would be great. I think that you shouldn't change salts often, but I may consider changing to reduce costs if I don't need it.
I was also using reefers best in my 50 gallon system WITH SPS and dosing only sponge power, biomate, amino acids, and coral vitalizer. I'll say that I think the only way I kept the SPS was the zeovit dosing, as I've never had good results with SPS, until that system. It lost it's groove when I moved to Utah for three months, and the SPS died off, probably because dosing stopped.
Edit: I've read up on this precipitate issue, and it doesn't seem to be any bad batch or issue that everyone could replicate. Here's an excerpt from their forum:
I think there isn't a bad batch or fake. If you are getting a white powder on the sides of the glass and moter this is almost certainly precipitation of calcium.
First, Precipitation can be caused by adding the salt too quickly; this will cause calcium to drop out of solution as the water becomes super saturated locally.
Second, If the water was warmed this can induce precipitation. If the water wasn't aerated before use high levels of CO2 dissolved into the water will reduce the pH of the RO water, it will also shift the Carbonic acid to the bicarbonate phase and it may increase the alkalinity to a level that will induce precipitation when the salt is added(above-mentioned by Alexander).
more powerful motor and use it within 1-2 hour......
Choi
http://zeovit.com/forums/showthread.php?p=207391