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Test for your levels of Chlorine or Bromine. These are effective disinfectants used against Bacteria and Algae. Easy to use, just fill the tubes with a sample of water from your pool or spa. Drop a DPD1 tablet in the side marked Cl & Br and replace the cap shake until the tablet is dissolved.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.