I want to clear up a few misconceptions since I have seen some confusion in this thread about the K-1005, K-2005, and K-1000 test kits, Taylor has a range of 1000 series test kits with different functionality geared at the home/residential market and a range of 2000 series test kits aimed at the 'advanced home/residential' (read Poolfourm community) and professional markets. I will say that the K-1000 is a useful additional test kit for quick daily testing if you know how to properly use OTO (which means learning the colors at low, normal, high, and very high TC levels) if you supplement it wth DPD or FAS/DPD testing at least weekly or when you suspect problems.
Acid and base demand tests are NOT worthless. In fact they are quite useful when lowing TA or have a situation where pH and TA have crashed. However, the acid and base demands in the K-2006 are much more precise than the ones in the K-1005 (because the 1000 series comparator uses an approx. 9 ml sample size and the 2000 series comparator uses a 44 ml sample size for the pH and demand tests) so it might be ok to say that the ones in the k-1005 are not as useful as the ones in the K-2006 but they are by no means worthless.
Just had to set the record straight.
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