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exactmeters.com
MODEL AQUATIC HEALTH CODE
AND NSF/ANSI 50 CERTIFICATION
The Model Aquatic Health Code (MAHC) is a set
of guidelines published by the Centers for Disease
Control and Prevention (CDC). This document
brings together the latest knowledge based on
science and best practices to help state and local
government of
fi
cials develop and update pool
codes. They may use the code in whole, choose to
use parts, or modify to
fi
t their needs. Use of the MAHC is intended
to save time and resources spent individually developing and
updating codes across the country, while giving agencies the
bene
fi
t of the latest science and best practices to help keep pools
fun, safe, and healthy.
The MAHC requires NSF/ANSI 50 certi
fi
cation of water quality
testing devices (WQTD) used in recreational facilities such as
public swimming pools, interactive fountains, and Waterparks.
Third-party certi
fi
cation to NSF/ANSI 50 allows manufacturers to
make veri
fi
ed claims regarding the performance, accuracy and
operating range of their WQTD. The performance testing of a
WQTD involves accuracy and repeatability testing on two different
lots of new production. Unlike most NSF/ANSI 50 certi
fi
cations,
WQTDs require follow-up testing of the product at the end of the
manufacturer’s speci
fi
ed shelf life. Certi
fi
ed products are given an
accuracy rating to one of three levels: L1, L2 or L3, with L1 being
the highest accuracy rating.
TEST
RANGE
ACCURACY RATING
POOL PARAMETERS
Combined Chlorine
0 - 12 ppm
L2
Cyanuric Acid
1 - 110 ppm
L2
Free Chlorine
0 - 12 ppm
L1
pH
6.4 - 8.4 pH
L1
