<https://hottubbing.co.uk/product/arctic-silver-sentinel-threaded-spa-filter-4/#webpage>
<http://schema.org/description>
"Buy 4 x Arctic Threaded Spa Filter for £100.00. Silver Ion disposable filter for use in Arctic Spas Hot tubs with a screw thread filter fitting."
<https://hottubbing.co.uk/product/arctic-silver-sentinel-threaded-spa-filter-4/>