I winterized the Cyclone today. I was getting a lot more air this year than last year. It was pink but very aerated. Hot water heater was bypassed. It was not sucking out the pink stuff like I expected it to, but I was getting pink out so I kept going. The pump was not shutting off when I shut the faucets, like it did last year. I knew something was wrong, the pump should be shutting off, but could not put my finger on it. I took the basement wall partition off behind the UDC to expose the pump, and I saw no leakage. Then for no known reason, it seemed like the system finally tightened up and started working right, and i got pink flow without air, and the pump started shutting off when I closed the faucets. I thought it was a big bubble and the system finally got solid. I pushed some more pink stuff out each faucet, and finished up the job. Then, when I went to put the wall partition back in, I saw pink stuff under the pump, not much - 1/8 cup. I took a closer look, and I found this threaded cup like thing on the suction side of the pump. I think the writing on this device said suction or vacuum side. It was loose, I could tighten it up maybe a 1/8 or 1/4 of a turn. I think it was drawing air still moving the pink stuff until it sealed up later when I thought things started working right. Anyway, I thought I would put this out there, in case someone else can't figure out why the pink stuff is so aerated. Check this cup like thing on the suction side of your pump tight. I will do this first from now on. I guess a season of going down the roads loosened it up just enough to cause me problems.