Tommy P. Just wanted to ask a question on your thread for Boomer related to specific gravity (sg).
I noticed my NaCl (not seawater) refractomer a cheap one. don't know the brand and another brand Sper scientific both have specific gravity and corresponding ppt concentration at 1.025 and 35ppt. I thought natural seawater was 1.0264 and 35 ppt (parts per thousand)
However the natural sea water refractometer sold by the Filter Guys mentioned on the previous page of this thread clearly show the corresponding sg of 1.0264 and 35ppt when looking through the prism to indicate sg.
Then I came across a dr. foster's and smith page showing the values of
red sea coral pro salt as follows: So are they incorrect?
* Replicates natural seawater to help support delicate marine life
* Enriched with refined minerals to safely elevate calcium levels and buffer capacity
* Natural, evaporated sea salt
Coral Pro Salt is specifically formulated for use with reverse osmosis water. Natural, evaporated sea salt is enriched with refined minerals to safely elevate calcium levels and buffer capacity. Replicates natural seawater to help support delicate marine life and invertebrates in home reef aquariums. Salt is produced by small batch process to ensure homogeneity and consistency of the salt mixture. Chemically balanced formula is nitrate and phosphate free.
Table shows calcium levels of Coral Pro mixed in RO water at 24?C/75?F and salinity.
s.g. Salinity Calcium Qty of Salt 1.021 30.6 ppt 420 ppm 33.4 g/l 1.4 lb/5 US gal 1.023 32.8 ppt 450 ppm 35.8 g/l 1.5 lb/5 US gal 1.025 35.0 ppt 480 ppm 38.2 g/l 1.6 lb/5 US gal Please click on
"More Information" for instructions.