Same Taylor Test Kit K-2005 - (Different Results)

[Watermom]

There is no way for us to determine why results are different from one person and kit to another. Maybe his reagents are old? If it were me and my kit was new, I'd probably go with my results. But, having said that, an alk of 80 is fine as well as an alk of 120. What kind of pool is this?

[waterbear]

ARe you both testing the same way? The proper way to do that test is to keep adding drops until one more drop produces no more color change and then don't count that last drop. I suspect he might be stopping at the first color change from green to red and if he added anouther drop the read would become more red. Also, his regents could be old and if the titrant is left uncapped it can become stronger as water evaporates and that would throw the results off. I suspect his kit is kept in a hot car or truck much of the day.

[wapate]

Since posting, I'm thinking my reagents may be old. I don't know how long my test kit was sitting before I purchased it, The pool cleaner goes through many bottles, so I would think his is probably newer than mine. I'm taking my water to a pool company, let them test, and see what they come up with. If they are in line with the pool cleaner I will have my answer. I just drained my pool after 14 years because I had what I call "Cake Icing Dribbles" on the walls. My TDS'S were off the scale. I'm now in the process of re-balancing my chemicals. It is a gunite pool. With the TDS'S removed, I want to balance the chemicals with as little addition of chemicals as possible. Thank's

Didn't think about temperature. Now you mention it, his reagents are kept in the back of his truck, exposed to the hot sun all the time.