Ever since I put borax in the pool last spring to 50ppm using the test strips as a guide, it has stayed at that level and after testing yesterday, it is still 50ppm even with all the rain we have had and all the backwashing and refilling I have done in a year's time. It is hard for me to believe this as I have had to add salt and CYA over time as pool water is lost down the overflow drain and from backwashing. Plus I still have a thriving colony of waterboatmen in the water.
I have to assume the Aquacheck strips are not reading correctly. Even testing tap water it shows 50ppm. Expiration on bottle says March of 2009 and bottle has been indoors and cap on tight. Is there another brand out there that may be more accurate?