(1) Skimmers may be used in place of overflow gutters as a means of skimming and circulating the water. Skimmers are permitted if at least one skimming device is provided for each 500 square feet of water surface area or fraction thereof, with a minimum of two skimmers required, except that spas or pools with less than 500 square feet of water surface and with a turnover rate that exceeds the minimum requirements under ARM Title 37, chapter 115, subchapters 1 through 22 by at least 25 percent.

(2) Skimming devices shall be built into the wall and shall develop sufficient velocity on the water surface to induce floating oils and wastes into the skimmer from the water surface of the entire pool, spa, or other water feature.

(3) The circulation system shall be designed to handle a minimum of 100 percent of the water turnover rate through the skimmers.

(4) An easily removable and cleanable basket or screen through which all overflow water must pass shall be provided to trap large solids. The skimmer shall be constructed of sturdy corrosion-resistant materials.

(5) The water level for skimmers must be maintained at the manufacturer's recommended level, which is normally at least one half the vertical height of the skimmer weir.

(6) Each skimmer shall be equipped with an equalizer line or other device to prevent airlock on the suction line should the water of the pool drop below the skimmer weir level, or the water level at the bottom of the skimmer. Equalizer line openings at the pool wall shall be covered with a fitting to prevent entrapment in accordance with ASME A112.19.8-2007.

(7) Skimmer covers located on a walking surface shall be securely seated, slip resistant, of sufficient strength to withstand normal deck use, and shall not constitute a tripping hazard.