AutoCAD RO Plant Flowchart Drafting

I need a clear, production-ready AutoCAD flow-chart of our industrial RO water-desalination plant. This first milestone focuses solely on the pretreatment stage and must show the filtration process in detail, specifying sand filtration as the chosen method.

You will receive hand sketches, equipment data sheets, and an existing P&ID excerpt. From these inputs I expect a neatly layered DWG that:

• Presents the full pretreatment sequence—from raw-water inlet through pumps, sand filters, and associated valves and instruments—using standard ISA symbols.
• Labels every component, line size, and flow direction so the drawing can be handed straight to operations.
• Fits on an A1 sheet and also exports cleanly to PDF for review.

Keep layer naming logical, maintain consistent line weights, and leave text editable. I’m open to suggestions on how the diagram could later expand to the reverse-osmosis and post-treatment stages, but please keep those elements as placeholders only if you add them.

Send the first draft within three days; I will mark up comments for one revision round before final sign-off.