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This is why my gravity-fed rainwater hose does not always water my garden, which is about the same level of my cistern but travels via a dip midway (I figured the dip would remove bubbles once filled with water, but I was wrong...not sure how bubbles form: bacteria? Out gassing of warmed water).

Very frustrating.

I use a valve to bleed water near the dip by turning the valve on and off to hammer out the bubbles. Takes forever and I'd like it to be automatic (because I want my rain water cistern to overflow to my garden too. But I don't want to get rid of the bubbles by going outside in the rain, or going outside at night)

How wide is the hose? According to the article, the bubble phenomenon happens in tubes several mm wide.

What happens when you remove the dip?

It's standard 1/2" drip irrigation feeder line.

I haven't ever removed the dip because otherwise, it would run through an area I don't want to see the hose.