Please assume positive intent on my part when you read this repones. My intention is entirely positive.
In a word, we can, and we do, defer providing advice based on test strips or pool store test results, but not for reasons you may think.
Without accurate results, we can actually do more harm to your pool, equipment, your pocketbook and most importantly to the health of our pool owner members. A simple example would be pool store results that indicate an FC that is appropriate for your CYA, sufficient to kill bacteria. If your test kit measured CYA higher, and your FC was lower, it could be that it is actually unhealthy to swim.
The LAST thing any of us want to do is to harm pool, equipment, your $$, and your health and well being. That is the reason behind our insistence on a test kit. We know, with proper testing, we won't be doing harm. That cannot be said for using pool store testing and test strips.
Using a professional quality recommended test kit is the cornerstone of TFPC. It is our DNA.
We believe any pool owner can achieve and maintain safe, crystal clear pool water, by using the science-based, Trouble Free Pool Care (TFPC) methodology.
www.troublefreepool.com
Please understand, all the Mod/Experts/Guides on TFP are volunteers. We contribute our time to help others.