100 DPD NO 1 Tablets (Test for Chlorine)

100 DPD NO 1 Tablets (Test for Chlorine) 100 DPD NO 1 Tablets (Test for Chlorine) for hot tub testing kits. These high quality tablets are a refill for your test kit. They test for chlorine in your pool and there are 100 in the pack. All our Tablets have at least 5-10 years expiry date from the day 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?