Converting Units of Ca (ppt to mq/l)

[Pomacanthus1]

is there an equation anyone knows of?

thanks!

[Randy Holmes-Farley]

ppt means parts per thousand

mg/L is the same as ppm, or parts per million

so you multiply by 1000 to go from ppt to ppm, assuming that they are actually measuring the same thing (and not equivalents of calcium carbonate or some such thing).