About This PHOSPHATE POOL WATER QUALITY TESTING KIT:50 Strips Water Chemical Testing for Hot tub and Spa, Quick and easy determination of water qualities in swimming pool HIGH ACCURACY POOL TESTING STRIPS:Merydi Water test strips are made of high-quality fiber paper and no color bleeding pads,can easily provide instant and reliable results,Use at least twice per week or as needed to monitor your water quality at regular intervals Easy & Accurate PhosphateTest Kit: 1. Add 5ml water sample into colorimetric tube 2.Put the strip into the colorimetric tube, close the cover tightly and turn upside down twice for 10 seconds. 3.Wait for 2 minute and then take out the test strip. 4.Follow the instructions to compare the color chart Water Test Kit : Suitable for swimming pool/ spa/hot tub, perfect for monitoring water quality FOR BEST RESULTS: Read results in natural daylight,Keep wet fingers out of the bottle and store test strips in a cool, dry place. Test strips are not reusable Overview Brand : Merydi Ph Range : 7.2-7.6 Recommended Uses For Product : Swimming Pool, Spa, Phosphate Test Unit Count : 50.0 Count Manufacturer : MERYDI