Chemical Storage and Safety
Pool chemicals in general are safe if properly stored and handled. Some chemicals should not be stored together and others should only be stored outdoors.
All chemicals should be kept in locked boxes out of the reach of children.
Separate Chlorine Products and Muriatic Acid
If chlorine and muriatic acid is mixed it will create dangerous gas. The two chemicals should never be stored where they can possibly mix.
Chlorine
=TriChlor Tablets
Dichlor
Cal-hypo
Liquid Chlorine
Muriatic Acid
Muriatic acid should be stored outside. Even when in closed sealed containers the fumes from muriatic acid can rust metals in the room around it. If stored in a garage the vehicles and metal shelves can rust due to the muriatic acid fumes.
Calcium
When mixed with water calcium can become very hot. Calcium should not be stored where it can become wet.
Other Chemicals
Stabilizer, baking soda, algaecides, and other chemicals require no special safety precautions or storage. If in doubt ask on the Forums.