Direct Pool Supplies
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Q: Why do my Test Strips read 0ppm for free chlorine, while my DPD test shows a free chlorine reading? |
A: If there is a high level of combined chlorine in your pool or spa, it is likely the DPD test is showing a false positive for free chlorine and your Test Strips are giving an accurate reading. |
Q: Do I need to test as frequently with test strips? |
A: Yes. We suggest testing both ends of the pool a minimum of 2 times per week, and spas before each use |
Q: Is DPD more accurate? |
A: The DPD test for chlorine 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. In addition, the DPD test requires careful technique and several steps to get the best test |
Q: How accurate are test strips? |
A: Test strips are at minimum comparable in accuracy to liquid colour comparator tests. Because test strips are more convenient, we believe they actually deliver greater accuracy. They reduce the chances of human error associated with liquid kits, which require measuring samples and counting drops of reagent |