I use a Villaware strainer for that. I would check the directions or call the manufacturer of the juicer, because some of juicers and strainers can't handle berry seeds. I believe the Kitchenaid fruit & vegetable strainer attachment can't handle berries, and the screen's warranty is voided if you break it with berry seeds. With a juicer I would think it could handle a few berry mixed in with some other fruit, so the seeds would be mixed with pulp, but it might break if there's nothing but seeds getting caught up in it.

The Villaware strainer has a specialized berry screen you can buy.

Melissa

Must also chime in, as the Villaware/Roma surpasses any other method of extracting juice and pulp from berries and tomatoes. With this food strainer, you need to use the smaller holes berry screen as the strainer that comes with the machine is useeful for larger seeds like that of a tomato. Not only do they rmeove seeds from berries, but also remove the skins and seeds from tomatoes. Its an invaluable tool for anyone wanting seedless preserves and sauces with no annoying seeds and skins. Some prefer the Foley, but if you were to consider the outpout speed of the Villaware, it can 'crank' out at least three times more liquid in the same time compared to a Foley. Also, a Foley would not handle tomatoes very well as they need to be blanched or cut up well to get them under the pressure paddle. About the only seeds a Villware can't handle well are the tiny ones in blueberries, but these are not as annoying to most people. With the Villware, you can also run the waste through a second time to remove even more of the juices and pulp. Forget regular strainers and jelly bags, as they are just too slow.