<https://www.chemtradelogistics.com/product/polyaluminum-silicate-sulphate-pass/#webpage>
<http://schema.org/description>
"Chemtrade produces Polyaluminum Silicate Sulphate (PASS) for certain applications. While not as widely used as Polyaluminum Chloride."
<https://www.chemtradelogistics.com/product/polyaluminum-silicate-sulphate-pass/>