Pool chemical shelf life varies dramatically: liquid chlorine lasts 2-5 years, granular chlorine 2-3 years, while pH adjusters and alkalinity increasers can last indefinitely when stored properly.
Pool stabilizer (cyanuric acid) does not go bad and has an indefinite shelf life when stored properly in a cool, dry place. However, exposure to moisture can cause clumping that affects dissolving.
Pool stabilizer (cyanuric acid) doesn't technically expire when stored in a cool, dry place. However, granular stabilizer can clump and lose effectiveness when exposed to moisture, while liquid forms remain stable longer.
Pool stabilizer (cyanuric acid) doesn't technically expire, but it can lose effectiveness if exposed to moisture or extreme temperatures. Properly stored dry stabilizer can last indefinitely.
Pool calcium chloride and calcium hardness increasers don't technically expire but lose effectiveness over time. Properly stored, they remain usable for 3-5 years, though moisture exposure reduces their potency significantly.
Pool chlorine tablets do expire and typically last 2-3 years when stored properly in a cool, dry place. Expired tablets lose potency and may become dangerous to handle.
