This is a barely-used brine shrimp hatchery dish kit including about 2.5 lbs. of Instant Ocean salt, 1.75 oz (about 1.5 oz. remaining) of Grade A brine, and 2 oz. of spirulina powder. Prior to having to dismantle the fish room, I found this excellent for small batches of brine for breeding Psuedomugils, killies, and other fish that tend to lay small batches of eggs continuously. The design does a great job of completely separating the hatched nauplii from unhatched eggs and shells. Both brine and spirulina have been stored in the refrigerator to prevent diminished hatch rates (for brine) and diminished nutrient levels (for spirulina).