QuestionDo I need to empty the pool if I had used all purpose sand but am switching it out?
Answerhelo vola, i switched the question and answer to publis so others may read it too.
im not sure i understand your question...
Do you have regular sand in your pool, or aquarium?
basically, you need to find ARAGONITE sand... all purpose maybe silica sand...
silica is not good for aquariums.. it will lead to algea blooms and higher silica levels...
look for aragonite sand.
good luck
pleaase let me know how you do, and how things work out.
you can join my new forum at www.thelittleocean.com
good luck,
bill