I tried it years ago on my brackish tank and horrid algae. MY LFS guy said never use it on my saltwater tank, so I never did. I did use Scripp's water for a brief period, which comes from the Sand Diego shore area, and had constant issues with low levels. Much better off with synthetic for so many reasons. As for good reef salt, Instant Ocean Reef Crystals and Red Sea Coral Pro are top notch quality. Red Sea is a little better because it stores for some time after mixing, but they have almost identical levels. I'd check with other local stores to see what they use, and make sure to ask how high TDS gets before they change their filters.