Our low temp was 8 in this entire thing, never lost power for more than 85 minutes during the rolling blackouts. Nothing froze and no leaks now. However, I noticed during the cold the pressure on the filter was in the 30-40 range with the pump on freeze protect high mode. After it warmed up, I took apart the filter and cleaned it. With the lid on the ground the gauge read 20 PSI. When I put it back together, 20 seems to be the new zero and it goes up from there. Did the freeze kill the gauge or could there be a bigger problem I can't see?