Section 2513(b)(2) of this title notwithstanding, in connection with any door-to-door sale of a residential water treatment system, it is an unlawful practice within the meaning of § 2513 of this title for any seller to:

(1) Fail to display on the person of each salesperson upon each visit to the home of a buyer an identification badge which conspicuously discloses the name and business address of the seller and the salesperson.

(2) Fail to furnish each buyer a business card or other writing that conspicuously discloses the name, address and telephone number of the seller and the salesperson.

(3) Perform or display during a visit to the home of a buyer a precipitation test or heavy metals test. A seller may perform an in-home aesthetic test and furnish to the buyer a document that conspicuously discloses the test results and that the aesthetic test is related to matters of personal taste and is not related to health. All health-related tests must be performed by a certified laboratory. Notwithstanding the preceding sentence, a seller may perform an in-home test of a water sample for nitrates, provided that if the buyer’s home is served by public water supplied by a municipal, utility or other community system, the seller also obtains at the seller’s cost a test for nitrates from a certified laboratory prior to completion of a sale and installation of a residential water treatment system.

(4) Fail to furnish to the buyer a copy of any report from a certified laboratory that pertains to a buyer’s home.

73 Del. Laws, c. 420, § 1.