So far I have had 2 doctors perform the same procedure on me. That leads me to believe it's safe. You feel similar as going to the deep end of a pool and the ear gets full of water. It is uncomfortable but so far no damage.

Just the plastic so that it fits on the opening of the ear canal and you can push the water directly inside it with as much pressure as possible

Does OP or somebody else have any recommendations for affordable filtered earplugs. I tend to struggle focusing on conversations when too much noise around and sometimes fail to hear properly. Hearing tests say I'm fine and should have no issues but I still struggle sometimes

Pump Warm to lukewarm water inside the ear through a syringe, tilt your ear downward when pushing the water so that all the earwax goes out . Do it a couple time per ear twice a year