– Test strips are at minimum comparable in accuracy to liquid color comparator tests. Because test strips require less user technique, we believe they actually deliver greater accuracy.
What information supports the accuracy of test strips?
– Our 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.
– No. DPD can be affected by interferences, such as an over-abundance of monochloramines or potassium monopersulfate (used for shock-treating pools.) These can give a false positive reading for free chlorine with the DPD chemistry. Recognized technical studies are available to support these claims.
– Test strips average 24 months dating from the time of manufacture, with the exception of AquaChek Silver and AquaChek Green for Cyanuric Acid. These two strips have an average shelf life of 18 months.
Can more values for each test be added to color charts?
– Yes. However there 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.
Do I need to test as frequently with test strips?
– Yes. We suggest testing both ends of the pool a minimum of 2 times per week, and spas before each use.
Can test strips be used after the expiration date?
– No. Test strips should be discarded when the expiration date on the bottle label is reached. This ensures the user they are getting reliable results.
Are test strips less accurate after the expiration date?
– If 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.