Review on Fritz PRO Chloride Anhydrous Chemical by Deborah Hale

I use Fritz salts so it made sense to increase the calcium levels. However, when mixing with Ro/DI water, keep in mind that this is an extremely exothermic reaction, causing the water to heat the glass container to levels almost impossible to touch. Be sure to let it cool before adding it to the aquarium. Never fill powder directly into the tank.