Transderma Precious Prills

How do you use prill beads? Do you put the whole bag in water? How long do they last?

I had two bags, one got hard and the other the beads stayed loose. The hard bunch should I throw them or are they still good.

How many grams is this product for $ 14.99?

Will it matter if I place the bag in only a 1/2 gallon mason jar instead of a 1 gallon size? I am so excited to try Prill water. Thank you so much.