private static IList<RefinementGroup> GenerateAvailableProductRefinementsFrom(IEnumerable<ProductTitle> productsFound)
{
  var brandsRefinementGroup = productsFound
    .Select(p => p.Brand)
    .Distinct()
    .ToList()
    .ConvertAll<IProductAttribute>(b => (IProductAttribute)b)
    .ConvertToRefinementGroup(RefinementGroupings.brand);
}