Mega Moisture Trap 5 "Substantially reduced condensation" Mrs Joanna Laffra 06 December 2018 I bought two of these recently to go on bedroom windowsills, as the windows were getting a lot of condensation on them. For the first week, I didn't see any difference, but then they seemed to kick in. Whether the tablets inside just needed some time to get going, I'm not sure, but they are working really well. They don't stop all of the condensation from forming on the windows, but they have definitely reduced it substantially. I can just give the windows a very quick wipe each morning now, instead of having to spend a couple of minutes drying them down. Really pleased with the results.