The In The Swim Winter Kit Basic Pool Kit is designed for pools up to 7,500 gallons, providing essential chemicals and testing supplies to help maintain water quality during all the months. This basic kit includes the necessary chemicals to combat algae and bacteria, ensuring a clean and safe swimming environment. With the brand's reputation for quality products, this is also including a winter kit an is a reliable choice for any pool owner looking to keep their water pristine throughout all season long. These were only used once. And the amount all included is estimated to last possibly at least two years. And even though it is being sold as used;it was all well maintained and cleaned out prior to putting in storage. This is really all you will need for maintenance year round.