Recently, many modifications related to standards have taken place
in the recreational and aquatics industries. Although these changes
are ongoing, below is a current overview of NSF/ANSI Standard 50
related product types, initiatives, codes, and laws that have been
revised or updated and could impact your business. NSF/ANSI
Standard 50 is the primary standard to which most pool and spa
products are evaluated, tested, audited, and certified. Being
up to date on the NSF/ANSI Standard 50 changes can help both you
and your business!
The following is a summary of recent changes to NSF/ANSI Standard
50, ongoing ballot items, open task group activities, and related
The 2010 version of NSF/ANSI Standard 50
had the following revisions:
1Addition of UV cryptosporidium inactivation evaluation,
testing, and certification requirements.
2Annex I was updated relative to to
give relative guidance on chlorinator sizing.
3Residual disinfectant level in pools and spas was revised
to refer to local public health codes.
The 2011 version of NSF/ANSI Standard 50
was issued with the following revisions:
1Addition of pump energy efficiency testing requirements
(i.e. CEC 400-2009).
2Vacuum service filter marking updated to specify collapse
3Update to data plate marking to allow use of Web address
for contact to obtain instructions.
4Skimmer language updated to defer to local codes to
determine if an equalize line is required or not.
5Added reference to IAPMO SPS-4 vacuum port fittings
evaluation and testing requirements.
6Revised mechanical chemical feeder requirements to allow
certification of a fixed rate chemical feeder provided it is
installed for use with an NSF 50 listed automatic controller.
7Filtration media section was
reorganized and marking and labeling requirements were added.
The 2012 version of NSF/ANSI Standard 50
(due later in 2012) will contain the following revisions:
1Annex H disinfection efficacy testing requirements were
revised to specify water quality details, tank sizes, flow rates,
and sampling points for bacterial disinfection efficacy testing as
well as clarification of the need to test with at least 2 bacterial
2Batch chlorinator testing
conditions of temperture and humidity were harmonized.
3Automatic controller installation instructions shall
require interlock with the pump.
4Removable Multi port valve handles shall be designed so
they cannot be incorrectly installed.
5D’Arcy Permeability and filter cake density testing
is required annually for pre coat filter media.
64 readings (not 3) shall be taken during each ORP test of
7Barriers standards for evaluation and testing of pool/spa
fences have been added.
8UV equipment life testing temperature was raised and
thewidened temperature range was widened.
9Copper/Silver ion generators harmonized, no longer must
supply test kit with generator.
10Update to require electrical products to be installed in
accordance with National Electric Code (NEC ) NFPA70 or other
national or local electrical code requirements.
11Updated data plate marking to allow use of Web address
for all product marking sections.
12Revised suction fitting standard reference from ASME
A112.19.8 to APSP-16-2011.
13Created a new section for pump strainers and marking
requirements (currently under review).
14Single rate flow through feeders may now be NSF 50
Certified provided they are used with NSF 50 automatic controllers
(currently under review).
Current NSF/ANSI Standard 50 Balloting and
Task Group work:
1Fittings: NSF 50 is being revised with a section to
address different types of specialty and plumbing fittings such as
deck drains, skimmer gutters and overflows, & water
2Valves: update to the valve
section to address additional types of valves for pool/spa
3Heaters: heat exchangers, heat
pumps, and coolers requirements are being added for natural gas
fired, electrical, passive and solar radiant collectors as well as
4Swim current generators: spas and swim/exercise spas have
finalized criteria for testing and certification of the entire
system for filtration, skimming, disinfection, structural
integrity, suction entrapment, and other requirements.
5The water quality testing device section of NSF 50 will be
updated with additional evaluation criteria to test and certify
water test devices for: total alkalinity, hardness, TDS,
6Ultra violet light system requirements are being updated
to require performance testing after life testing as well as other
7Turbidity, filter media, & pre-coat filter
requirements are being evaluated for changes that will better
corroborate superior passing requirements into more quantifiable
8Salt water requirements are being developed that will go
beyond the current corrosion resistance requirements and
potentially introduce separate tests of products for salt water
9Skimmer requirements are being revised to address skimmer
designs that don’t have the strainer basket accessed through
a hole in the pool/spa deck. Such skimmers tend to be smaller and
used on smaller pools and spas such as those for exercise, therapy
10Ozone system testing and evaluation requirements for
cryptosporidium destruction are being balloted into NSF 50.
11Pool and spa chemical evaluation and testing requirements
are being developed by this task group.
12Chemical feeder requirements are being re-evaluated for
different applications such as when the feeder is used with or
without an automatic controller.
13Pump requirements are being modified to address 2-speed,
multi-speed, and variable speed pumps as well as systems that infer
flow rate and other data to ensure that the readings are accurate
and not misleading.
14The materials task group is evaluating additional
requirements for flexible pool and spa hose such as crush
resistance testing, pull load strength and updates to the
15Green requirements are being developed for various
products such as pumps, filters, skimmers, and other devices. The
premise is a performance comparison to systems with and without the
“green” product to yield a calculation of energy,
chemicals, time, and cost savings.