Water Storage Tanks Supplier: Writing an Enquiry That Produces Comparable Quotes Send the same one-line enquiry - 2,000 cubic metres of potable water storage - to five suppliers and you will receive five quotes that differ by more than the spread in their prices. One includes the foundation, one excludes it. One quotes 3 mm shell plate because it assumed a low tank, one quotes 5 mm because it assumed a tall one. One has NSF/ANSI 61 certification on the coating, one has never