rbdickey Posted June 15, 2012 Report Posted June 15, 2012 After opening pool and balancing ph, we have added shock, but it is not registering on the test strips. Added more shock, to no avail. Any advice? Quote
waterbear Posted June 16, 2012 Report Posted June 16, 2012 Get an inexpensive two way test kit that has yellow drops for chloirne and red for pH. Test it with that. If that does not register then you really don't have chlorine. If it does then the strips are the problem. Report back which it is. Also, a bit more info about your pool and what chemicals you have added as well as how the water looks and what kind of filter you have would help. Your post is akin to posting in an auto forum : I put a quart of oil in the car and filled the gas tank and it is making an funny noise, what is wrong with it? We really need more info to be able to help you. Quote
PoolGuyNJ Posted June 16, 2012 Report Posted June 16, 2012 If the ingredients on the package say monopersulfate, you will never see chlorine. High levels of chlorine can bleach out the color too. Plain DPD tests as found on strips are good to 5 ppm. OTO is good to 10 ppm. Using a DPD-FAS powder based test is good to 50 ppm. If you used a chlorine based powdered chlorine, such as cal-hypo or bleach, the DPD-FAS test is the proper test. Scott Quote
waterbear Posted June 16, 2012 Report Posted June 16, 2012 I OTO is good to 10 ppm OTO is a bullitproof test that wiil always tell if you have chlorine or not and, by the color, the approximate rannge: Colorless no chlorine very pale yellow under about 2 ppm yellow under about 5 ppm deep yellow under about 15 ppm orange in the neigborhood of 25-30 ppm brown very high It is not a precision test but as a rough guide of where the total chlorine is it can be useful. One of it's main drawbacks is that it cannot distinguish between free chlorine and combined chlorine. Also, many strips use syringaldazine for testing free chlorine (which does not bleach out) and use an OTO/copper complex for testing combined chlorine or total bromine. Others uses DPD for both tests and do bleach out. However, I agree that FAS-DPD testing such as found in the Taylor K-2006 and the LaMotte 7022 is the way to go Quote
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