About this item 【Vertical floating is considered a normal phenomenon】Say Goodbye to Green Water - Our winter kit maintains the clarity and vibrant blue color of the pool water for the next season. Carefree Pool Opening - Bid farewell to laborious pool maintenance rituals in the coming year. Efficient Solutions for Time, Effort and Money. 3-in-1 Dual Protection - POOLHACKER winter kit safeguards pool surfaces without compromising other treatments. Suitable for All Pools - The two balls are suitable for any shape or size of pool with a capacity of 30,000 gallons or below. Easy to use - Simply place two winter balls in the pool before closing, saving time on pool shutdown without the need for complex procedures. › See more product details