If you have a swimming pool, then you know that you have to do some work to maintain it and keep it in good condition during the winter months. One important thing to do is to use a winterizer pill, and the SeaKlear AquaPill AP71 is a great option. This AquaPill is made to float under your winter cover all season, and it performs well with mesh safety covers. The pill has a patented 6-month delivery system, and it is safe for all surfaces and filters. Plus, the all-in-one formula is an exclusive 4-part blend to make spring openings easier.