What salt do you use?
I picked up some Instant Ocean Reef Crystals salt yesterday for the reef tank. There was a good deal on it so I stocked up. One box of salt has 4 bags in it. Each bag of salt will last me for two weeks worth of water changes (~50 gallons). So I should be good for 48 weeks with 6 boxes.
I’ve used Reef Crystals for the past 4 years and think it does a good job. I specifically buy these boxes because each of the four bags is sealed and makes 50 gallons of saltwater at about 1.023 salinity. I enjoy not having to measure out cups of salt for 50 gallons, so the bags make life a bit easier. 🙂