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🧊 Keep your pool flawless through winter’s freeze — because clear water waits for no one!
In The Swim Winter Algaecide is a powerful, cold-weather pool treatment designed to prevent all types of algae growth during winter months. Its non-staining, non-foaming formula works under ice and snow, ensuring your pool stays clean and hassle-free until spring. Compatible with all pool surfaces and filtration systems, this 1-quart liquid algaecide offers a one-time application solution that saves time, money, and stress for pool owners who demand crystal-clear water year-round.


















































| ASIN | B002WKQ0PU |
| Best Sellers Rank | #2,699 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #11 in Swimming Pool Algaecides |
| Brand | In The Swim |
| Brand Name | In The Swim |
| Customer Reviews | 4.7 out of 5 stars 862 Reviews |
| Item Form | Liquid |
| Item Highlight | Prevent Blue-Green, Green, Yellow, and Black Algae All Winter Season |
| Item Weight | 2.6 pounds |
| Manufacturer | In The Swim Discount Pool Supplies |
| Manufacturer Part Number | C050001012AE |
| Model Number | C050001012AE |
| Number of Items | 1 |
| Number of Packs | 1 |
| Package Size Name | 1 Quart |
| Product Benefits | Controls Algae |
| UPC | 758293053424 |
| Unit Count | 32 Fluid Ounces |
R**.
The Swim Winter Swimming Pool Algaecide reall works.
I highly recommend The Swim Winter Swimming Pool Algaecide. All the stains disappeared in about two days. The green went away,
A**.
Quality Products
I have been buying Pool Life products for several years and have always been satisfied with them. I just purchased Winterizing Algaecide, and while I haven’t used it yet, I am confident that it will work as well as their other products. Cost was good and shipping was fast. Very pleased with this purchase.
L**.
It works beautifully
I'm very pleased with this. I'd been fighting algae for the last 2 years. Even though I had been super shocking it , it came right back because I forgot to add algaecide after the chlorine level dropped... That's on me. So as I was putting it up for the winter I added this and I didn't want to close it. Lol It's not looked that good in awhile.
L**R
all good so far
with the winterizing algicide you won't know if it did a good job until the spring/summer. SOOOO, we shall see. I like just being able to pour into pool without a lot of different steps. I just make sure that all your levels are very high and then pour in pool (spread around), without filter on. You do not filter this. It goes in just before you put the cover over the pool. So, hopefully it will be as clear when I open as it was when I closed.
N**F
As Advertised
Always use In the Swim. Always timely and quality products. You can even call them for questions answered. Reliable for sure
C**E
Best algaecide for closing pool over winter
Best algaecide for winter! Our pool opening always sucked because it was so green. Tried this over winter, pulled the cover back to start opening and was amazed by how clear it was! Opening will be a breeze!
A**R
Prevents Algea
This stuff works!! I will definitely buy purchasing it again.
C**S
Does what it is intended to do!
It works. Nothing more to say. It does what it is supposed to and intended to do.
Trustpilot
4 days ago
2 months ago