Hague Quality Water Intl H2500 用户手册

Arsenic (As) is a naturally occurring contaminant found 
in many ground waters. It generally occurs in two forms 
(valences or oxidation states): pentavalent arsenic (also 
known as As(V), As(+5), or arsenate) and trivalent 
arsenic (also known as As(lll), As(+3), or arsenite). In 
natural ground water, arsenic may exist as trivalent 
arsenic, pentavalent arsenic, or a combination of both. 
Although both forms of arsenic are potentially harmful 
to human health, trivalent arsenic is considered more 
harmful than pentavalent arsenic. More information 
about arsenic and its toxicity can be found on the U.S. 
Environmental Protection Agency Web site at 
http://www.epa.gov/safewater/arsenic.html. 

These appliances (Model Numbers; H3000 and 3500) 
are designed to remove only pentavalent arsenic. 
These appliances do not provide a feature for 
conversion of trivalent arsenic to pentavalent arsenic. 
The appliances may remove some trivalent arsenic; 
however, they have not been evaluated to remove 
trivalent arsenic. 

Trivalent arsenic is generally more difficult to remove 
from drinking water than pentavalent arsenic. Trivalent 
arsenic can be converted to pentavalent arsenic in the 
presence of an effective oxidant such as free chlorine. 
The arsenic in water containing detectable free chlorine 
or that has been treated with another effective oxidant 
will be in the pentavalent arsenic form.¹ Treatment with 
chloramines (combined chlorine) is not sufficient to 
ensure complete conversion of trivalent arsenic to 
pentavalent arsenic. 

Consumers using public water supplies can contact 
their utility to verify whether free chlorine treatment 
chemicals are being used.

¹ Laboratory Study on the Oxidation of Arsenic lll to Arsenic V, 
EPA/600/R-01/021, March 2001 available online at: 
http://www.epa.gov/ORD/publications/ordpubs.html 

Private water supplies and waters that do not have 
detectable free chlorine residuals should be analyzed to 
determine the form(s) of arsenic present and the 
potential need for oxidation of trivalent arsenic to 
pentavalent arsenic. 

Arsenic does not generally impart color, taste, or smell 
to water; therefore, it can only be detected by a 
chemical analytical test. Public water supplies are 
required to monitor treated water for total arsenic 
(trivalent arsenic plus pentavalent arsenic) and the 
results are available to the public from the utility. 
Consumers using private water sources will need to 
make arrangements for testing. A total arsenic test 
usually costs about $15-$30 and it is recommended the 
test be conducted by a certified laboratory. Local health 
departments and environmental protection agencies 
can help provide consumers with a list of certified 
laboratories. Some laboratories may also be able to 
analyze specifically for (speciate) the two forms of 
arsenic present in a water sample if requested. 

These appliances were tested under laboratory 
conditions as defined in NSF/ANSI 58 Reverse 
Osmosis Drinking Water Treatment appliance and were 
found to reduce 0.30 mg/L in the test water to less than 
0.010 mg/L, under standard testing conditions. Actual 
performance of the appliance may vary depending on 
specific water quality conditions at the consumer’s 
installation. Following installation of the appliance, the 
consumer should have the treated water tested for total 
arsenic to verify arsenic reduction is being achieved 
and the appliance is functioning properly. 

The pentavalent arsenic removal component of these 
appliances must be replaced at the end of its useful life 
(approx. 3 years). The replacement component 
#200290 can be purchased from the original source of 
this appliance (retailer or distributor), from other 
sources of these appliances, or directly from the 
manufacturer.

WaterMax RO Owner’s Manual 

11/11/2009

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