Air in the container can affect pH.
If you take a sample with you to work, and have it tested after work, the results can be affected by sitting in the hot car all day.
The person behind the counter doesn't know how to do the test properly.
The person behind the counter doesn't care if the testing is done properly.
Never trust the person that is going to sell you things with your pool water testing results.
I thought a list of reasons might help some of the new posters that come here looking or help!
If you take a sample with you to work, and have it tested after work, the results can be affected by sitting in the hot car all day.
The person behind the counter doesn't know how to do the test properly.
The person behind the counter doesn't care if the testing is done properly.
Never trust the person that is going to sell you things with your pool water testing results.
I thought a list of reasons might help some of the new posters that come here looking or help!