it is an adjustable from a trickle to more. It fills in less than 10 seconds, wonderful unit. The bubbles are very tiny, I thought that it was degassed, stirred it real good but bottled immediately after stirring.
The first batch, with the new filler, to be bottled was a Riesling that had a combination of argon, nitrogen gas put on it after the last racking. There were no bubbles in it.
Next bottling was 1 week later.The next batch was a Pinot Noir. It was stirred. Added a little sugar 1/2 cup to 5 gallons and bottled. As the wine was coming up the tube I saw little bubbles at times. It went into the wine bottle and we saw bubbles. My husband used the vaccum pump and tried to get as much of the air out of the wine bottle as possible.
Forgot to answer your question-no filter with the filler. May get one later. I love this filler but of course I am still learning. thank you kathy