With a 5,000 gallon pool I can't imagine that you would need a truly "bulk" amount. I'm in the general area and I just buy mine from All Seasons Pool and Spa, they have been wonderful to work with and don't try to sell me anything I don't ask for. I buy two 4 gallon totes at a time, but that's with a 30,000 gallon pool that uses about a quart a day in season. I wouldn't buy more than a single tote with a pool your size.