Why are there bubbles in the tubing?
We can find there have bubbles in the tubing when the filters are working. maybe you will think is it the filters leak so Produce bubbles？
We can tell you, that tubing have bubbles is normal phenomenon. Example-Bear. the bear dissolve lots gas, But you can not see before you open the bottle. But will produce lots bubbles when you open and ready to drink.. that because of the Pressure difference.
The same principle, The fuel also dissolve gas, when the filters are working, there are pressure difference of the outer and inner of the filters. so that will appear the bubbles.
So that tubing have bubbles is normal phenomenon when the filters are working.
But the Filters quality is not base on no leak no quality problem, the filteration efficiency is the quality index.
The poor quality filters with low efficiency or without efficiency, with low cost, The good quality filters with good quality filtration material, so the cost is high, the price should be high.
