Just drop it in the tank and forget about it. Works great.
I was disappointed when I realized just how many Wondershells it would take to increase the calcium in my 65 gallon tank. Might be good for small tanks but is not the solution for me.
works great in my 5 tanks
Works great in my 3 tanks
second purchase of this item...it came so fast...very happy with service
Over $ 49.00
Under $ 49
$ 4.99 Flat Rate