Well, I pondered for years how to increase the amount of humidified ozone one could put in the colon, and how I did not like the limiting factor of only being able to get a specific small amount of ozone up into the colon due to the limited open volume inside the colon. I knew one poor misguided fellow who used a pump instead of just the regulated oxygen bottle pressure and exploded his colon.
Water helps carry ozone across cell walls into the body.
This charging output must be vented to outside room. Catheter is purged of air, but this is not essential. The ozone line is pre attached to the catheter. We now have two parallel yet staggered depth catheters, one hooked to the ozone medical grade machine, one not attached to any thing, and vented to air. No pressure build up this way.