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These DPD No 1 high quality Tablets are for PHOTOMETER use only. They test for Chlorine, Bromine and Chlorine Dioxide in your Swimming pool or Hot Tub. All our Tablets have at least 2-3 years expiry date from the day you buy. Confused about your hot tub water chemistry? Our guides answer the most Frequently Asked Questions! Why do I need to test my hot tub / spa / swimming pool water chlorine levels? Why do I need to test my hot tub / spa / swimming pool water pH levels?