BLU52 pool care products provide you with an all-in-one pool maintenance solution, saving you time and energy, and giving you more time to enjoy the clear blue water of your swimming pool. The 4-week value pack provides you with an easy-to-store product with a once-a-week measured application. Our products are fast-acting, convenient and easy to use. Most importantly, our simple solution is guaranteed to work. Always follow the instructions on the package.