Tips To Close Your Pool

Karin Carr, Owner
Published on September 29, 2021

The summer of 2020 and 2021 saw the sale of pools, and homes with pools, skyrocket. In July of this year, “… a basic vinyl in-ground pool — without the bells and whistles of heating, decking or any further customization — costs $85,000 on average, up from $60,000 to $65,000 in 2019,” said Zachary Kussin at

As a result, a huge swath of the American public has been subjected to crash courses in subjects such as balancing the chlorine and pH levels in their pools, checking alkalinity and calcium hardness levels, keeping the pool chlorinated, and more.

With winter just a few months away, their next question will be “What do I do to get this thing ready for winter?”

If you’re among the curious, read on.

Open your pool early and close your pool late

It’s tempting to want to get a head start on closing your pool as summer winds down and kids head back to school. Tempting, but not wise.

“If you close your pool while the weather is still warm, the winter protection chemicals you’ve added will often not last until spring,” according to Lana Seidman with HIC of Staten Island, Inc., a non-profit trade association

She goes on to explain that “… pool chemicals are consumed much faster in hotter temperatures versus cooler temperatures.”

How hot is hot? Sixty degrees Fahrenheit appears to be the magic number. This is the temperature at which algae goes dormant, according to Seidman. Wait until the water temperature remains consistently lower than 60 degrees before closing your pool.

Tips To Close Your Pool

Give the pool a good scrub

The experts at Thatcher Pools recommend that you “… grab the pool brush and your telescoping pole and start scrubbing. Scrub everything from the walls to the floor, and get to the nooks and crannies if you can.”

Not only does this process loosen debris but also algae spores that may have settled into those nooks and crannies.

Finally, vacuum up all the loosened debris.

Get those chemicals balanced

Here’s what to aim for, according to those pros at Thatcher Pools:

  • pH: 7.2 to 7.8
  • Alkalinity: 100 to 150 parts per million (ppm)
  • Chlorine: Less than 5 parts per million.

Add an algaecide (never add this when the chlorine level is high) and pool enzymes next. Consider using a Winter Pill that will work all winter long.

You’ll also want to shock the pool, regardless of how clear the water is. Find a shock product designed to be used when closing a pool that contains “… at least 65 percent hypochlorite.”

No, the work isn’t over yet, but this gives you a good head start. You’ll find pool closing walk-through tutorials and videos online.

Control the Water Level

If you reside in a region that frequently experiences freezing temperatures, the water level in your pool should be about four to six inches below where the skimmer or tile line is. It is not advisable to drain a significant amount of water from a pool that has a vinyl liner or is made of fiberglass. Always refer to the recommendations provided by the pool builder or manufacturer for the winter water levels whenever they are available.

In regions that do not experience freezing temperatures and in which the equipment will not need to be disconnected, the pool should be kept at regular operating levels or higher.

Set up a winter pool cover

A properly fitted winter pool cover is critical for maintaining your pool clear and clean when not in use. There are two kinds of winter covers on the market: mesh and solid vinyl. Mesh coverings are less expensive and require little upkeep throughout the winter, but they can let debris into the pool’s water.

A pump is required to drain rainfall and snow melt from the top of solid coverings. Continue to take precautions such as securing pool fence gates to prevent a small child or pet from drowning in water that collects on the cover before draining. A robust cover that stays put should keep the water clear.

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