$paged                = 3;
$slider_price_min_val = 0;
$slider_price_max_val = 10000;
$slider_size_min_val  = 1.5;
$slider_size_max_val  = 10.7;
$discont              = 'off';

$query_args = array(
	'post_type'      => 'product',
	'posts_per_page' => 9,
	'orderby'        => 'meta_value_num',
	'order'          => 'ASC',
	'post_status'    => 'publish',
	'paged'          => $paged,
	'meta_query'     => array(
		'relation' => 'AND',
		array(
			'key'     => '_price',
			'value'   => array( $slider_price_min_val, $slider_price_max_val ),
			'compare' => 'BETWEEN',
			'type'    => 'NUMERIC'
		),
		array(
			'key'     => 'product_filtration_longest',
			'value'   => array( $slider_size_min_val, $slider_size_max_val ),
			'compare' => 'BETWEEN',
			'type'    => 'DECIMAL'
		),
		array(
			'key'     => 'product_discont_on',
			'value'   => $discont,
		)
	)
);