S-TR
Gel Neutral Inert Resin as Intermediate Spacer-Layer for Tri-bed Water-purification Systems

QL-2
Inert Cylindrical Pellets as Strainer Guard for Downflow Regeneration in Upflow Service Packed Bed Systems
EPS-FB
Inert Spherical Pellets as Covering-Layer for Countercurrent Regeneration in Floating-Bed Systems
LP-FX
Inert Laminating Polymers as Spacer-Layer Preventing Layers In-Disorder in Fixed-bed Countercurrent Collection Systems