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Tips for Installing Water Bags

Water bags are the easiest and most effective way to hold down your winter pool cover. Built from heavy-duty vinyl designed to withstand sub-zero temperatures, water bags provide peace of mind. Once installed, you know your pool cover will be secure all winter long. It's just a matter of knowing which type to get and how to install the water bags correctly.

What are Pool Cover Water Bags?

Water bags are designed to sit around the edges of your winter cover. They keep the cover firmly in place, even in the windiest conditions. All of Leslie's water bags are made from durable 20-gauge vinyl, which has been treated with UV inhibitors plus antibacterial and antifungal additives. Built using non-leak seams and full-size 1.5" Roberts fill valves, they will hold up during long, cold winters. Leslie's offers many different sizes and types of water bags, including single channel, double channel, corner bags, winter cover blocks, and above ground cover weights. Keep reading to learn about which water bags you should have, how many you need, and how to install your water bags or blocks properly.

Tips for Choosing and Installing Water Bags

Water Bags

  • If your pool cover came equipped with water bag loops around the edge, use single-channel bags. If the cover came without loops, use double-channel bags or winter cover blocks so they don't roll away.
  • Place water bags around the perimeter of the pool cover, 18 inches apart. In very windy areas, it may be beneficial to place the bags end to end.
  • Only fill water bags 1/2 to 3/4 full. Water will need room to expand when frozen. A small amount of non-toxic pool antifreeze may be added to help guard against freeze damage.
  • Never use sharp or abrasive items, such as bricks, cinder blocks, or railroad ties, to weigh down your pool cover. To prevent rips and tears in the cover, always use water bags or winter cover blocks.
  • If you experience problems with small animals or birds poking holes in your water bags, consider switching to more sturdy winter cover blocks. Rolling bags into the edge of the cover can also provide an extra layer of protection.
  • Before installing your water bags and winter cover blocks, they can be filled using a standard garden hose.
  • When installing the bags, ensure the filler caps are facing upwards.

How Many Water Bags Do I Need for My Pool?

When installing water bags around your pool cover, you'll need to lay them end to end. If you're not sure how many bags you need for your pool, use this handy chart as a reference point:

Pool Size Number of Water Tubes
12' x 24' 6 x 8', 4 x 10'
15' x 30' 2 x 4', 10 x 10'
16' x 32' 4 x 8', 8 x 10'
16' x 36' 2 x 4', 4 x 8', 8 x 10'
18' x 36' 2 x 4', 2 x 8', 10 x 10'
20' x 40' 2 x 4', 12 x 10'
24' x 44' 4 x 8', 12 x 10'
25' x 45' 16 x 10'
30' x 50' 4 x 4', 16 x 10'
35' x 55' 20 x 10'

If you have any other questions about water bags or how to close your pool, feel free to call or visit your nearest Leslie's location. We carry a large selection of pool closing chemicals, tools, and accessories to protect your pool or spa through the cold winter off-season.

Recommended Products

Winter Pool Covers

Winter Pool Covers

Pool Closing Water Tubes

Pool Closing Accessories

Submersible Pool Cover Pump

Pool Cover Pumps

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Leslie’s makes every effort to provide accurate recommendations based upon current ANSI/APSP/ICC-5 2011 (R2022) standards, but codes and regulations change, and Leslie’s assumes no liability for any omissions or errors in this article or the outcome of any project. You must always exercise reasonable caution, carefully read the label on all products, follow all product directions, follow any current codes and regulations that may apply, and consult with a licensed professional if in doubt about any procedures. Leslie’s assumes no legal responsibility for your reliance or interpretation of the data contained herein, and makes no representations or warranties of any kind concerning the quality, safety, or suitability of the information, whether express or implied, including, without limitation, any implied warranties of merchantability or fitness for a particular purpose.