I don't think it is bad for the filter. You might be reducing the effectiveness of your filter though. And as you said it sounds disgusting.
For a bubble wand that long you probably have air coming in at both ends of the wand. Mabey you could cut it in half and have no bubbles in the middle where the filter is.
Dance as if no one were watching
Sing as if no one were listening
Live each day as if it were your last
9 L. Cearuleus
5 C. Moorii
4 P. Acei
2 N. Venustus
2 I. Sprengerae
1 unidentified Mbuna
1 Peacock with a slightly deformed tail.