Fish tank vacuum for enema

This works great for enemas

It has a ball pump on it that pushes the fluid of your choice up your rectum with great control

Need more info such as model and maybe a picture. Also how you have it setup to use as enema pump

Sounds like you made a basic in line pump. ( Higginson syringe )

Make a Google search about ~~ fish tank vaccuum ~~ some stuff look to be interesting to experiment.