4-Way Test Strips – A quick and easy way to test your spa water, these test strips will check Free chlorine or bromine, pH and Total Alkalinity. Simply dip a test strip into your spa water and remove immediately, wait 15 seconds and compare colour of pads with the standards printed on the bottle. Maintain sanitiser between 3-6mg/l, pH between 7.4-7.6 (bright orange) and total alkalinity between 125-150mg/l for ideal water balance and safe and comfortable spa water. If you live in a hard water area also dose your spa weekly with Stain & Scale Control to prevent scaling.