HTH, 4 LB, Pre-Measured Water Soluble pH Up Pods, Easy To Use Pods Make Dosing Simple & Quick, Keep Your Pool Water Comfortable For Bathers & To Protect Pool Surfaces & Equipment From Damage, The pH Of Pool Water Should Be Maintained Between 7.2 & 7.8, Help Reduce pH Drift & Erratic Changes When Adjusting The pH By Testing The Total Alkalinity Each Week & Maintaining It Between 60 & 120 PPM, Raises pH Levels, Prevents Corrosion Of Metal & Plaster Surfaces, Prevents Eye & Skin Irritation From Pool Water, Compatible With Salt Water Systems, Contains Eight 8 OZ Pods.