I purchased this item to spray soluble fertilizer on my garden. The mixture I'm using is somewhat viscous, about midway between the consistency of water and molasses. As such, it was not siphoning properly...well, not siphoning at all would be more accurate. I found that for my purposes, I had to remove the small filter screen at the bottom of the siphon hose, once that was done the mixture flowed properly and everyone lived happily ever after.