tax terms (ukproduct)

$tax_query = array(
	array(
		'taxonomy'         => 'nxpage_category',
		'terms'            => array( 'system-one', 'cartridges', 'dialysis-fluids' ),
		'field'            => 'slug',
		'operator'         => 'EXISTS',
		'include_children' => false,
	),
);