The pool closing kit that decides whether spring opens clear or green
Is this the right fit?
- Best for
- in-ground and above-ground pools in freezing climates, and anyone who has opened a pool in spring and immediately regretted how they closed it
- Skip if
- It is sized for 15,000 gallons, so a larger pool needs a bigger kit or a second one, and underdosing a big pool wastes the whole effort
- Check before ordering
- Confirm the dimensions, exact model, included parts and return terms on the Amazon listing before ordering.
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This In The Swim closing kit bundles the winterizing chemicals for a pool up to 15,000 gallons into one pre-measured package: a chlorine-free shock to oxidize organics before the cover goes on, a winter algaecide dosed to last through the cold months, a stain and scale preventer to keep metals from staining the surface, and a floating dispenser. The logic of a closing kit is that the pool sits untouched for months, so whatever is in the water in October is what multiplies by April. Getting the chemistry right before covering it is what separates a clear spring opening from a green one. Best fit: in-ground and above-ground pools in freezing climates, and anyone who has opened a pool in spring and immediately regretted how they closed it.
Pros
- Chemicals are pre-measured for the pool size, so there is no dosing math in October
- Winter algaecide is formulated to last through months of cold rather than days
- Stain and scale preventer keeps metals from marking the surface over winter
- Costs far less than the shock and labor a green spring opening requires
Cons
- It is sized for 15,000 gallons, so a larger pool needs a bigger kit or a second one, and underdosing a big pool wastes the whole effort
Frequently asked questions
How do I know my pool size?
For a rectangular pool, multiply length by width by average depth in feet, then by 7.5 to get gallons. Round pools use the radius squared times pi times average depth times 7.5. If you land above 15,000 gallons, size the kit up.
When should I close the pool?
Once water temperature is consistently below about 60 degrees F. Closing while the water is still warm lets algae keep growing under the cover, which defeats the purpose of the chemicals.
Do I still need to balance the water first?
Yes. Balance pH, alkalinity and calcium hardness before adding the kit. Winterizing chemicals work as intended only in balanced water, and out-of-range pH over the winter is what causes staining and scale.
Does this kit include a cover or plugs?
No, it is the chemical package plus a floating dispenser. Winter cover, skimmer plugs and an air pillow are purchased separately.
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