FacetWP – use taxonomy for slider

<?php

// Add the following to your (child) theme's functions.php and re-index afterwards

add_filter( 'facetwp_index_row', function( $params, $class ) {
    if ( 'gewicht' == $params['facet_name'] ) {
        $params['facet_value'] = $params['facet_display_value'];
    }
    return $params;
}, 10, 2 );