Here are some mixing instructions from 2 of the most widely used salts....I don't see anything about waiting till clear....
Instant Ocean & Reef Crystals Synthetic Sea Salt
Instant Ocean Sea Salt
Mixing Instructions:
Mix Instant Ocean salt with reverse osmosis or distilled water for optimal results. Tap water can be used, but it must be treated with dechlorinator prior to use.
Stir vigorously to thoroughly mix salt and water. Although the solution can be used immediately, we suggest that you aerate the water with an air pump to adequately oxygenate the water prior to use.
Adjust salinity with an accurate hydrometer such as the SeaTest® Hydrometer full range specific gravity meter. Recommended specific gravity range: 1.020 to 1.023 at 75°F. If specific gravity is too low, add more Instant Ocean salt. If too high, add more dechlorinated water.
Tightly reseal bag to keep moisture out. Be sure to store remaining Instant Ocean salt in a cool, dry place.
Important Reminders:
NEVER mix salt in an aquarium containing animals. In new aquariums, transfer animals to the aquarium only after salt is completely mixed, the solution aerated, and specific gravity adjusted correctly.
Water Changes:
We recommend monitoring your water parameters (nitrates, phospates, alkalinity, and pH) and performing 25% water changes as necessary. To prepare small quantities of Instant Ocean salt for use in your water changes, use 1/2 cup of Instant Ocean salt for each U.S. gallon of water. Mix as directed above.
Reef Crystals Reef Salt
Manufacturer's Mixing Instructions:
Mix Reef Crystals salt with ordinary dechlorinated water. Because water conditions at different locations vary tremendously, a commercial dechlorinator is recommended to completely neutralize any concentrations of chlorine and/or chloramines.
Stir vigorously to mix salt and water. Although the solution of Reef Crystals premium sea salt can be used immediately, it is suggested that you aerate the water until it reaches oxygen/carbon dioxide equilibrium before use.
Use an accurate hydrometer, such as the SeaTest® Hydrometer full range specific gravity meter, to adjust salinity. Recommended specific gravity range: 1.020 to 1.023 at 75°F. If specific gravity is too low, add more Reef Crystals salt. If too high, add more dechlorinated water.
Tightly reseal bag to keep out moisture. Store remaining Reef Crystals salt in a cool, dry place.
Remember:
NEVER mix salt in an aquarium containing animals. In new aquariums, transfer animals to the aquarium after salt is completely mixed and aerated and specific gravity is adjusted correctly.
Water Changes:
A 25% change of aquarium water, done on a monthly basis, is recommended to maintain water quality. To prepare small quanities of Reef Crystals salt, use 1/2 cup of Reef Crystals salt for each U.S. gallon of water. Mix as directed above.