I needed to clean out the subtrate, so I figured between the back of my truck, the garrage and under the sink I should be able to make somethin.
Here is what I found-
one end goes on the filter intake, the other in the subtrate. this way I can clean out the subtrate, then clean out the filter, then do a water change without making 10 trips in and out with a bucket.
The problem I see with your set-up is you can't see in the water bottle and, the bottle is too short. You're going to wind up sucking stuff up that you don't want to suck up, & you won't know it until it's too late.