Also this may help:
Yup! That will tell you all you need to know. It is actually really easy to do. I have the same douche as yours and it is not too bad for it's price, though I can't use a douche like that anymore because of bad joints and pain etc, so difficult for me to get in the right angle to use it these days. I'd need one with a longer and flexable 'hose' piece.
I can't douche any way because of a condition I have that causes a lot of discomfort to douche and use anal toys. Which is a shame. But that douche was only used once and was steralised and cleaned proparly and has been given it's tour of usefulness for non-anal jobs! (Sounds awful, I know, but I used it for cleaning out an infected tooth which had been drilled open and I had to clean the root of the tooth every day. Using it to put saline solution in the exposed tooth, then using it for blowing air through it to dry it before putting the swab back in each day. Became a perfect routine and the dentist said he couldn't understand how I'd kept it so clean, but I did a very good job! I wasn't exactly prepared to tell him what I had used! Lol! I do emphasise the fact I had cleaned and steralized it thoroughly though!)
I'm impressed! That's a stroke of improvisational genius.
Regarding the original question, I have this item, it's really comfortable and effective. I usually find two or three flushes does the job fine. I would not go so far as to do ten or more, if you're needing to do that you might have diorhear or loose stools, in which case you're better off avoiding anal until things are back to normal.