Wow. This thing seems to be doing just fine now. Checked SG(.020) so I added 2nd 1/3 of sugar and swished real good. I'm using my 24" plastic paddle with 6 holes in it. Seems to put good amount of air bubbles into mix. Temp 75 degrees. Would you believe not 2 minutes after puting lid back on, the airlock got active for about 30 seconds! Pretty cool to know it's working.