Provides maintenance when pools are not in use. Facilitates cleaning at season openings. Its application is easy and practical. It is a pool chemical that protects the pool in the winter months by preventing algae formation, microorganism growth and lime deposits in the pools and allows easy cleaning in the new season. It is economical to use. Dosage is easy. It facilitates the commissioning of the pool at the opening of the season. It reduces the cleaning cost of the pool. It is beneficial to use after pH adjustment and shocking with chlorine. Feeding can be done manually. With its algae preventive feature, it facilitates the cleaning of the pools at the beginning of the season.