За урл отвечает вот этот файл blocklayered.js. Я там нашел вот такой код. Уверен, что где то здесь собака зарыта. Если кто понял, то отпишитесь
Код:
// Currente page url
            if (typeof(current_friendly_url) == 'undefined')
                current_friendly_url = '#';
                
            // Get all sliders value
            $(['price', 'weight']).each(function(it, sliderType)
            {
                if ($('#layered_'+sliderType+'_slider').length)
                {
                    // Check if slider is enable & if slider is used
                    if(typeof($('#layered_'+sliderType+'_slider').slider('values', 0)) != 'object')
                    {
                        if ($('#layered_'+sliderType+'_slider').slider('values', 0) != $('#layered_'+sliderType+'_slider').slider('option' , 'min')
                        || $('#layered_'+sliderType+'_slider').slider('values', 1) != $('#layered_'+sliderType+'_slider').slider('option' , 'max'))
                            current_friendly_url += '/'+sliderType+'-'+$('#layered_'+sliderType+'_slider').slider('values', 0)+'-'+$('#layered_'+sliderType+'_slider').slider('values', 1)
                    }
                }
                else if ($('#layered_'+sliderType+'_range_min').length)
                {
                    current_friendly_url += '/'+sliderType+'-'+$('#layered_'+sliderType+'_range_min').val()+'-'+$('#layered_'+sliderType+'_range_max').val();
                }
            });
            if (current_friendly_url == '#')
                current_friendly_url = '#/';
            window.location = current_friendly_url;
            lockLocationChecking = true;
            
            if(slideUp)
                $.scrollTo('#product_list', 400);
            updateProductUrl();
            
            $('.hide-action').each(function() {
                hideFilterValueAction(this);
            });
        }
    });
    ajaxQueries.push(ajaxQuery);
}
function initLocationChange(func, time)
{
    if(!time) time = 500;
    var current_friendly_url = getUrlParams();
    setInterval(function()
    {
        if(getUrlParams() != current_friendly_url && !lockLocationChecking)
        {
            // Don't reload page if current_friendly_url and real url match
            if (current_friendly_url.replace(/^#(\/)?/, '') == getUrlParams().replace(/^#(\/)?/, ''))
                return;
            
            lockLocationChecking = true;
            reloadContent('&selected_filters='+getUrlParams().replace(/^#/, ''));
        }
        else {
            lockLocationChecking = false;
            current_friendly_url = getUrlParams();
        }
    }, time);
}
function getUrlParams()
{
    var params = current_friendly_url;
    if(window.location.href.split('#').length == 2 && window.location.href.split('#')[1] != '')
        params = '#'+window.location.href.split('#')[1];
    return params;
}