{HEAD ~ The treatment container} may be positionable below, at, or above {TAIL ~ ground level} 
positionable below
{ HEAD ~ The treatment container } may be positionable below , at , or above { TAIL ~ ground level }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL