Code of Maryland Regulations
Title 10 - MARYLAND DEPARTMENT OF HEALTH
Part 3
Subtitle 17 - SWIMMING POOLS AND SPAS
Chapter 10.17.01 - Public Swimming Pools and Spas
Section 10.17.01.47 - Test Kits
Universal Citation: MD Code Reg 10.17.01.47
Current through Register Vol. 51, No. 19, September 20, 2024
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.
Disclaimer: These regulations may not be the most recent version. Maryland may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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