update() (либо addSlide() и removeSlide()). slider-filter__item фильтруете swiper-slide и потом вызываете update()
var swiper = new Swiper('.swiper-container', {
// Default parameters
slidesPerView: 1,
spaceBetween: 10,
// Responsive breakpoints
breakpoints: {
// when window width is >= 320px
320: {
slidesPerView: 2,
spaceBetween: 20
},
// when window width is >= 480px
480: {
slidesPerView: 3,
spaceBetween: 30
},
// when window width is >= 640px
640: {
slidesPerView: 4,
spaceBetween: 40
}
}
})