<http://schema.org/telephone>
"1-800-277-3458"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.discountfilterstore.com/water-filters.html?amp%3Bmedia_primary_filter=String-Wound+Polypropylene&brand=Carron+Phoenix+Tri-pure&life_months=6>