D.C. Mun. Regs. tit. 12, r. 12-K704
Strike Section 704.1.4 of the International Green Construction Code in its entirety and insert new Section 704.1.4 in the Green Construction Code in its place to read as follows:
Efficiency and listing. Water softeners that regenerate in place, that are connected to the water system they serve by piping not exceeding 1 1/4 inches (31.8 mm) in diameter, or that have a volume of 3 cubic feet (0.085 m3) or mo re of cation exchange media shall have a rated salt efficiency of not less than 4,000 grains of total hardness exchange per pound of salt (571 g of total hardness exchange per kg of salt), based on sodium chloride equivalency and shall be listed and labeled in accordance with NSF 44. All other water softeners shall have a rated salt efficiency of not less than 3,000 grains of total hardness exchange per pound of salt (429 g of total hardness exchange per kg of salt), based on sodium chloride equivalenc y.
Strike Section 704.2 of the International Green Construction Code in its entirety and insert new Section 704.2 in the Green Construction Code in its place to read as follows:
Reverse os mosis water treatment systems. Point-of- use reverse osmosis treatment systems shall be listed and labeled in accordance with NSF 58. Point-of-use reverse osmosis systems shall be equipped with an automatic shutoff valve that prevents the production of reject water when there is no demand for treated water.
Strike Section 704.3 of the International Green Construction Code in its entirety and insert new Section 704.3 in the Green Construction Code in its place to read as follows:
Onsite reclaimed water treatment systems. Onsite reclaimed water treatment systems shall be listed and labeled to NSF 350. These systems shall include gray water, rainwater, and other nonpotable water reuse treatment systems and wastewater treatment systems used to produce nonpotable water for water closet and urinal flushing, surface irrigation and similar applications.
D.C. Mun. Regs. tit. 12, r. 12-K704