Anyone here use the “Tupperware” type cover for their skimmer and the expandable rubber hole plug for the return? This was the first winter I tried it and a few weeks ago, during our first thaw here in Chicago, I noticed water coming out of the return. Now that all the ice is melted, I find that my water level is about half. The plug appeared to be moved by the ice and became useless. Anyone else have this happen and/or what do you think is a better set up for next year – I hate $$ filling the pool every year.