Keeping your pool clear over Winter by topping up the chlorine levels is one of the simplest thing, but it will save you so much time and money in the Spring when your pool is Crystal Clear, rather than looking like a swamp. Using a Pre-Filled Floating Chlorine dispenser can keep your pool water Clear and Algae free all Winter. We have a 2kg Pre-Filled Chlorine Tablet Dispenser for only £29. It will keep your chlorine level up until Spring.