{TAIL ~ The overall weight} of {HEAD ~ the dispenser} is such that it is immersed when initially deposited into the liquid and is buoyant in the liquid when the reactive material has dissolved 
{ TAIL ~ The overall weight } of { HEAD ~ the dispenser } is such that it is immersed when initially deposited into the liquid and is buoyant in the liquid when the reactive material has dissolved
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH