Not long started this very addictive hobby and have bought a wine filter just to make my wine extra clean anyhow I've been told dozens of times try and keep getting oxygen into wine and beer to a minimum, so when I used the filter for the first time, as the wine passes through the filter it splashes big time back into the demijohn is this ok or am I thinking too much? But then why sell it if it was going to spoil your pride and joy