Md. Code Regs. 10.17.01.47

Current through Register Vol. 51, No. 22, November 1, 2024

Section 10.17.01.47 - Test Kits

A. In order to comply with the requirements of Regulation .46 of this chapter, an owner shall ensure that:

(1) One or more of the following for measuring the disinfectant level is used:

(a) A chlorine or bromine test kit that is the DPD (diethyl-p-phenylene diamine) reagent system for measuring free and combined chlorine or total bromine with an indicator range from 0.0 to 10.0 ppm or with procedures for performing a dilution test to achieve readings up to 10.0 ppm.

(b) An ozone test kit that is the indigo trisulfonate method for measuring ozone with an indicator range from 0.0 to 1.0 ppm,

(c) A copper test kit that is accurate to within +/- 0.1 ppm for measuring copper,

(d) A PHMB test kit with an indicator range from 0.0 ppm to 75 ppm, or

(e) A hydrogen peroxide test kit that is the DPD reagent system with an indicator range from 0.0 to 40 ppm;

(2) A phenol red test is used to measure pH with an indicator range from at least 7.0 to 8.0;

(3) An alkalinity titration test is used to measure alkalinity as milligrams per liter calcium carbonate;

(4) An EDTA (ethylenediamine-tetraacetate) hardness test is used to measure calcium hardness as milligrams per liter calcium carbonate; and

(5) A cyanuric acid test kit with an indicator range from 0 to 100 ppm is used if cyanuric acid is used in the pool or spa.

B. In order to comply with the requirements of Regulation .46 of this chapter, an owner may monitor:

(1) Chlorine and bromine residuals by measuring the oxidation-reduction potential (ORP) of the water before the disinfectant injection point; and

(2) The pH with a pH meter.

C. If an ORP or pH meter is used, an owner shall ensure that:

(1) Periodic calibration is performed on these instruments to assure accurate measurements; and

(2) Manual measurements are performed on a daily basis.

Md. Code Regs. 10.17.01.47