Refill Test Strips to Test Pool Chemicals or Spa Water Fast! Get easy-to-read pool chemical test results for Free Chlorine/Bromine, pH, and Total Alkalinity (low, ok, or high indicators for each test parameter) with the Aqua Check Pool and Spa Digital Test Strips. Only for use with the AquaChek TruTest Digital Reader, sold separately. Results in seconds! No guesswork is required to interpret color results.