"i think that this is a good overall product, use it on all of my salt water tanks. I can however point out two bad things about this product. the first is previously stated that the instructions have given me problems with high salinity, but thats no big deal you just go by trial and error. The second problem i have found with this product is the salt seems to set the waters ph at around 7.8 instead of 8.3, but once again not a very big deal, just use a buffer 8). On the other hand, this product is affordable, dissolves fast, and leaves water crystal clear and fish inverts and corals happy."