I was lucky that my surgeon suggested Metamucil upon my hospital discharge. It’s certainly an easy and very low risk thing for any J-poucher to experiment with. A teaspoon is a fairly low dose, and trying various amounts up to the dose suggested on the packaging can be worthwhile to find the sweet spot. I hesitate to be specific about the dose, because the different formulations (e.g. sugar-sweetened vs. sugar-free) contain different amounts of psyllium per unit volume.