Downloads See below for a range of resources to assist with the successful design and installation of your project. All Download Categories Product Downloads (7) Brochures (5) Installation Manuals (2) Regulations (1) Technical Standards (2) Sewerage Sector Guidance – Appendix C WPL Diamond Brochure WPL HiPAF Brochure Environmental Permitting Regulations British Water Flows and Loads 4 GRAF Wastewater Treatment Brochure PremierTech Aqua EcoFlo Brochure PremierTech Aqua Solido Brochure GRAF one2clean Log Book GRAF one2clean installation manual