I have read that I should not depend on strips, so I was looking at the test kits that do FAS-DPD as many on this website recommend. Does anyone know the difference between the TAYLOF K-6000 AND THE TAYLOR K-6000C? they both claim to do FAS-DPD tests, however the price is considerably higher on the last one. The only difference I can see is the size of the test bottles,(.75 oz. or 2.0 oz.) Any help as I have not been a pool owner very long. Thank You