<https://roseofjericho.co.uk/product/pulverised-fuel-ash/#webpage>
<http://schema.org/description>
"Pulverised Fuel Ash (PFA) is a pozzolanic additive, extracted from spent fuel hoppers of coal fired boilers and ground to a fine powder."
<https://roseofjericho.co.uk/product/pulverised-fuel-ash/>