Wick System

2:30 pm in Seeking Advice by schoolgardener

I am working with 3rd-5th graders on growing plants hydroponically in their classrooms.  Before attempting the full windowfarm structure, I worked with my students to build individual hydroponic systems using the hand-pump and water-wicking system.  While the hand-pumps we built seem to be working, our yarn-wicks are not wicking any water up…

Any suggestions on materials (other than yarn) that works well for a wick system?