Liquid Chlorine is great for quickly bringing the chlorine level up and is a quick and easy way to keep your pool sanitized all year. Up to 3x stronger than household bleach. It is best used fresh and not recommended to be stored for longer periods of time. Liquid Chlorine has the shortest shelf life of all your pool chemicals, losing up to 50% or half of its potency six months from when it was first opened and up to 90% after a year. Sold in a case of 4 gallons only. Due to supply chain issues, limit three cases per customer for the time being. This product can NOT be shipped. Must be picked up in-store or curbside