This is our first year to try out a fog machine. We got a super big one (Techno 1000). Its supposed to cover 8000 cu. ft. We got Ground Fog Liquid for it since we were hoping to have low lying fog in the backyard. We tested it out last night. Fog immediately went about 8 ft in the air & quickly disappeared. Tried it inside w/the same result. Any ideas what the problem is & how to fix it??