By controlling the rate at which the water exits the pipe, although it's more effort than it's worth. Sometimes I spend hours outside trying to get the level right. So it works, only if you're willing to put in the effort. I'm going to get it changed soon, it's really annoying because last night I was outside until 2AM making sure it didn't overflow.
Any slight change is either too much or too little. And by a slight change I'm talking barely any change in the position.
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