EasyCare 36664 PoolTec Winter Lay-Up Pool Treatment, 64 oz. Bottle Provides strong fall-winter pool treatment; No spring cleanup Keeps pool water clear and algae-free with little or no chlorine Keeps pool water treated and protected during non use periods Extremely easy to use. Just pour in. No pool testing and chlorine routine Save time at spring pool startup: rebalance pool water, chlorinate and swim