I used the pool essentials last week to shock while we were gone for the week on vacation it's cheap in my area $5-7Typically we recommend adding 5 ppm of chlorine daily until your kit arrives. For your pool that would be about half a gallon of 10% liquid chlorine. I recommend the Pool Essentials Chlorinating Liquid from Walmart, but Lowes, Home Depot, and most hardware stores will have liquid chlorine as well.