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Q:When I dissolve Reef Builder™ at the prescribed 4 tsp per gallon in R.O. water the resulting solution is cloudy and does not clear upon standing. Also some I find some of the material is very stubborn to dissolve. Is this normal?
A: When dissolving at the prescribed concentrations it is normal for the solution to be somewhat cloudy. Add the Reef Builder™ to your RO water, and stir it for a few minutes or let it stand about 10 minutes, then add it to your tank, it will dissolve rapidly at this point. Predissolving the Reef Builder™ is recommended mainly as a more gentle delivery method (as opposed to just putting the dry product directly in the tank!) not as something you would dose with (in which case you would want it all dissolved). It is also normal for small amounts of the material to not be dissolved if you let the RO or DI water and Reef Builder™ solution sit overnight... small amounts of calcium carbonate can form sometimes within the bottle, and it is this material (chalk) which is very insoluble. It will eventually dissolve in the tank however since the amounts are very small and the volume of the tank is many times greater than the 1 gallon of RO or DI water.