I have a 200 litre water tank on my balcony with a submersible pump at the bottom and a hose + drip system attached.
Pump is supposed to automatically switch on twice a day while we're on vacation.
During the first week of testing, the tank was running almost empty already while I calculated 200 litres to be sufficient for about 2 weeks.
The problem is, that the water which remains in the hose creates underinflation which sucks the tank empty even with inactive pump. Water continues to flow till the water level in the tank reaches the height of the sprinkler outlets attached to the end of the hose.
Do you have any suggestion how to avoid ongoing waterflow with disabled pump? I can't really move the plants to a higher location so the water level in the full tank will always be above the level of the output sprinklers.
This is the pump I am using https://www.amazon.de/dp/B00B18KADW/