I just read about colostomy irrigation and I was wondering if anyone here has any experience with it? I am thinking about getting a colostomy bag, and I was considering this method.

I read about it here - https://www.nhs.uk/conditions/colostomy/living-with/
Irrigation is an alternative to wearing a colostomy appliance. It involves washing out your colon with water either every day or every other day.
To do this, you gently insert a small device into your stoma and attach it to a bag full of water.
You slowly move water into your colon so it washes it out. The equipment is then disposed of once the process is complete. A cap is used to cover your stoma in between irrigations.

Advantages of irrigation include:
you choose when you want to perform irrigation
you don't have to wear a colostomy appliance (but may have to wear a small cap)
you should be able to enjoy a more varied diet
you should have less gas (flatulence

Disadvantages of irrigation include:
it's a time-consuming process that takes 45 to 60 minutes to complete, usually on a daily basis
for the best results, irrigation should be carried out at the same time every day, which may be difficult when you're away from home on holiday or with work