How do you drip water from a plastic bottle a drop at a time ?

@pimagro24 (1046)
Thailand
October 5, 2008 8:22am CST
I'm using plastic bottles filled with water to drip slowly. The problem is the water does not flow at all with one hole punctured. With another hole punctured at the top of container the water just seeped off too fast. Anyone has a suggestion on how to make the water drip slowly like a drop at a time albeit the water is minimal for the plants ?
1 person likes this
2 responses
• United States
6 Oct 08
Drill the one hole, but drill it slightly larger than you did the first time. If the hole is too small, the surface tension of the water will keep the air out. By making the hole a little bigger, the surface tension across the hole will not be as strong and the occaional bubble will force its way in, forcing a drop of water out. You may have to experiment a bit to get the drip rate exactly right. Good Luck.
@Ldyjarhead (10159)
• United States
5 Oct 08
I'm no physics expert, but would putting a string in the hole make any difference? I'm just wondering if the string would absorb and drip from there.