if (isset($_GET['filter_category']) && !empty($_GET['filter_category']))
    {
        $category = $_GET['filter_category'];
    }

    else
    {
                    $category = 'networks';
    }

if (isset($_GET['filter_network']) && !empty($_GET['filter_network']))
    {
        $network = $_GET['filter_network'];
    }

    else
    {
                    $network = '';
    }

if (isset($_GET['filter_recurring']) && !empty($_GET['filter_recurring']))
    {
        $recurring = $_GET['filter_recurring'];
    }

    else
    {
                    $recurring = '';
    }

'post_type'      => 'post',
'posts_per_page' => -1,
'tax_query' => array(
'relation' => 'OR',
    array(
        'taxonomy' => 'category',
        'terms'    => array( $category ),
        'field'    => 'slug',
        'operator' => 'IN',
    ),

    array(
        'taxonomy' => 'network',
        'terms'    => array( $network ),
        'field'    => 'slug',

    ),

    array(
        'taxonomy' => 'recurring',
        'terms'    => array( $recurring ),
        'field'    => 'slug',

    ),

),