This is my idea for an air trap anda crude fill and flush system. I'm not sure how what I'm going to do for a general drain plug for the system if I just want to empty all of the liquid in the tubes.
The input pipe, marked by the arrow going upward will direct the oxygenated air towards the top of the trap; while the exit pipe marked by the downward arrow will take the hopefully less oxygenated water back into the system. The top will be pvc pipe that can be unscrewed for easy filling.
And if I can fabricate a good enough connection that can be attached and detached from the input pipe, it would be possible to drain the liquid incoming to the trap out of the system and pour new liquid, such as a cleanser, into the system at the same time and cycle the system all at once. But I suspect that a t-line or a drain plug will still be needed to do a complete empty of the system.
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