100 Phenol Red Tablets (Test for pH)

100 Phenol Red Tablets (Test for pH) 100 Phenol Red Tablets (Test pH) These high quality tablets are a refill for your test kit. They test for PH 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 ?