(1) Water testing shall measure the following parameters using an FAS-DPD test kit which measures concentrations with precision through the process of titration:

(a) free chlorine and/or bromine;

(b) total chlorine;

(c) pH (colorimetric test);

(d) total alkalinity (at least 10 ppm titration calibration ability);

(e) cyanuric acid (0-100 ppm turbidimetric test); and

(f) calcium hardness (at least 10 ppm titration calibration ability).

(2) An approved Diethyl-p-phenylenediamine (DPD) titration method test kit must be used to test chlorine level in the water when chlorine is used as the water sanitizer.

(3) An approved DPD type kit shall be used to test bromine levels when bromine is used as the sanitizer.

(4) Test strips are not an approved method of accurate testing.

(5) If a DPD test kit is not available for reading the higher pH readings allowed for hot springs, the licensee may request that the department approve use of a test kit that meets an accuracy standard set by the manufacturer that falls within ± 0.2 pH. Testing equipment verified for accuracy by the manufacturer may be approved by the department.

(6) The department may approve an alternative testing method if the method can accurately measure the parameters listed in ARM 37.115.1301(1).