test strips really work?
Test strips were developed in the medical diagnostic
industry in the 1960's. Since that time, they
have replaced liquid reagent tests for urine
and blood testing. Swimming Pool Test Strips use that
accurate are test strips?
strips are at minimum comparable in accuracy
to liquid color comparator tests. Because test strips are more convenient, we believe they
can sometimes deliver greater accuracy. They reduce
the chances of human error associated with liquid
kits, which require measuring samples and counting
drops of reagent.
supports the accuracy of test strips?
test strips are manufactured and released against
standard reference procedures from the 17th
Edition of Standard Methods For the Examination
of Water and Waste Water.
a DPD liquid pool tester more accurate?
DPD test for chlorine can be affected by interferences,
such as an overabundance of mono-chloramines
or potassium mono-persulfate (used for shock-treating
pools). These can give a false positive reading
for free chlorine with the DPD chemistry. In addition, the DPD test requires careful
technique and several steps to obtain the best test results. Some of the better test strips will test for Free, Total and Combined chlorine, just as the reagent style of dropper bottle test kits do.
more values for each test be added to color
would not be enough color differentiation between
the values. This would make it difficult for
the user to make a decision when comparing the
test strip to the color patches on the label.
is the difference between AquaChek and the
other pool and spa test strips available on
is the top-selling brand of pool and spa test
strips in the world. AquaChek test strips undergo
stringent release qualification. Constant monitoring
of the manufacturing process ensures that the
finest test strips are available for your use.
I need to test as frequently with test strips?
We suggest testing both ends of the pool a minimum
of 2 times a week, and spas before each use.
test strips less accurate after the expiration
the test strips are handled and stored properly,
they should give reliable results through the
expiration date on the bottle label. It is impossible
to determine how reliable the results will be
after the expiration date has passed.
Strips vs. Liquid Test Kits
testing method should you use?
don’t have to be a chemist to keep your pool
sparkling clean. To keep things simple, use a testing
method that you find fast, easy and convenient.
That way you’ll be more likely to stick to your testing
regimen. There are two basic types of testing
method used by most consumers: test strips and liquid
kits require that you put a sample of water
into a plastic comparator and then carefully
add drops of chemical reagent, watching for
a change in the color of the sample. Liquid
test kits with the reagent OTO were once widely
used to measure chlorine, but they have fallen
out of favor in recent years. OTO measures
only total chlorine, not free chlorine, which
is the form of chlorine most effective in sanitizing
your pool. In addition, we now know that a
chemical reagent in the OTO-type kit has been shown to be carcinogenic.
using the liquid reagent known as DPD do measure
free chlorine. However, if you test for free
chlorine using a DPD #1 liquid test kit, be
aware that high levels of combined chlorine,
or chloramines, can cause false-positive results
when testing free chlorine. Substances such
as monopersulfate (used for shock-treating
pools) can also affect the results of the DPD
test by causing a false positive reading. Used properly, DPD kits and especially FAS-DPD kits, can give excellent results.
strips, the easiest method for pool and spa
water testing, are fast and simple to use because
they eliminate the need to measure samples
and count drops. Typically, you simply dip
a strip in the water for one second and then
remove it. You then compare the color on the
strip to the color chart on the label.
Industry and water quality experts report that
test strips are comparable in accuracy to
liquid kits. In fact, many believe they actually
deliver greater accuracy than liquid
kits because they require less technique.
Many local and state health departments now
recognize AquaChek test strips as an approved
testing method. This means that professional
pool and spa service technicians as well
as other industry experts trust the accuracy
of AquaChek pool and spa test strips.
there are reliable test strips available
to test a wide variety of pool conditions,
including cyanuric acid and total dissolved
solids as well as free chlorine, pH and total
matter what type of test kit you decide to use,
be sure to follow the manufacturers recommendations
to get the best results.
Other Methods to Obtain Greater Accuracy in pool water testing include:
- Use Fresh Reagents, most have a shelf life of 1 year.
- Test strips typically have a 24 month shelf life.
- Store reagents and test strips in a cool, dry location, out of direct sunlight.
- Take your water sample or dip your strip under the surface. Testing surface water may yield inaccurate results.
- Keep your testing vials clean and rinse them well between tests.
- If you test gives an unusual result, test again to be sure before chemical adjustment.