Before you can reopen the pool for summer swims, you need to clean out the gunk and restore the wate

Opening your backyard swimming pool for the season takes more than filling it up and jumping in. Gene DeFalco, president of DeFalco Pool & Spa of Fair Haven, NJ, has been in the swimming pool business for over 30 years, and he knows the importance of opening a pool correctly—both for the health of the swimmers and the pool. "If a swimming pool is opened properly, you can be assured of proper operation and chemical safety," he says. Here's your eight-step guide to getting ready for lazy summer afternoons.

1. Don't Empty Your Pool

First, DeFalco says, never empty your swimming pool, even if you live in a really cold climate, unless you have no other choice, such as if you need to do structural work or your pool hasn't been covered and there are too many leaves at the bottom to remove. (Also: Get a cover. Really.) That's because draining the pool can bring big problems. For example, an empty pool in a high water table can lift out of the ground without the weight of the water holding it down.

DeFalco says most pool owners aren't even aware of the risk. "People think they're going to empty and clean their pool but they either do it in a very wet season when there's a high groundwater table, or their swimming pool actually sits in a high water table," he says. "When you empty a pool in a high water table, it's very possible that the pool will pop out of the ground like a boat." That could mean a complete pool replacement.

2. Start It Up

Start the process of bringing your pool up to shape with a "Spring Assembly." Put the filtration system together, clean out all the baskets, and remove any plugs that you put in when the pool closed last year. Fan fold the cover, roll it up, and leave it on the deck for a day or two to dry out before storing. Don’t forget to put down those anchors, as they can be the source of countless stubbed toes throughout the Summer. Finally, prime up your pump and get your filter system running.

3. Top It Off

Fill up the pool higher than normal, as backwashing and vacuuming to waste will lower the level. Make sure to clean the filter before you turn it on. Clean a cartridge filter by removing the cartridge and wash with a hose. If you have a D.E. filter, you might need to take it apart, clean it, and reassemble it. If you have a sand filter, set the filter to backwash, which will clean the sand. Then turn it to the normal setting.

4. Housekeeping

After you've removed the cover, time to get all the leaves and debris from the bottom. When you add chlorine, it attacks all the organic matter in the pool. So, the idea is the more stuff you can manually remove from the water, the more your chlorine will work be able to work to clear the water. Remember when you vacuum that you should vacuum to waste, otherwise your filter while clog up to quickly. Only add chemicals after the initial vacuum.

5. Have a Pro Test Your Water

DeFalco recommends having the water professionally tested. Take a water sample to a swimming pool store, DeFalco says, and they'll test the water for you, usually for free (including at DeFalco Pool & Spa in Fair Haven). "It's a good idea because they'll do a complete test," he says. "They'll test the mineral content of the water, along with the total alkalinity and the pH and the chlorine levels." They'll tell you which needs to be adjusted and by how much.

6. Balance Your Chemicals

Time for some chemistry, based on your pool pro's analysis. Here are DeFalco’s recommendations:

First off, go down to your local pool store and see if they recommend an opening chemical kit. DeFalco Pools uses a Hassle Free Kit (composed of a phosphate remover and a metal stain remover), an algaecide, a water clarifier, and most importantly chlorine. The size of your pool, your filter type, and the current state of the water are all determining factors on how much and when to add each chemical. Snap a picture of your pool and bring a water sample down to your local pool store to get the most accurate advice.

PH levels between 7.2 to 7.8. The pH level dictates how much chlorine turns into hypochlorous acid in the water. Use soda ash to increase pH; muriatic acid or sodium bisulfate to decrease.

Total alkalinity from 80 to 120. Alkalinity is a pH buffer—pH levels will be consistent if the alkalinity level is correct. Use sodium bicarbonate to increase alkalinity, muriatic acid to decrease it.

Calcium hardness from 150 ppm to 250 ppm (parts per million). This is directly dependent on the hardness of the water. The softer the water, the more calcium it will absorb from its environment. "If you don't put [calcium] in the water, it will take it from the grout in the tiles," DeFalco says. "It will actually ruin a marble dust (a finish product), it will even effect vinyl." Adjust the calcium hardness by using calcium chloride.

Chlorine from 1 ppm to 3 ppm (may have to be higher when dealing with a green pool) A popular product for backyard in-ground pools are cyanuric-based tablets (the ones that look like large white hockey pucks). "Cyanuric acid inhibits the sun's ability to burn off chlorine," DeFalco says. "It's like a sunscreen for the water."

You can put the tablets in your skimmer baskets, but their low acid content means they'll eat metal—a problem if your pool has a metal filter system or a heater with a copper heat exchanger. Additionally, tablets can wear down the piping beneath the skimmer, which can lead to a costly repair tearing up your decks down the road. So DeFalco recommends getting a plastic chlorinator, which attaches to the filter system. Get a pro to hook this up.

7. Wait for the Water to Clear

Don't dive in yet. Keep the filtering running 24/7 and backwash every day until the water is clear. Expect the entire process to take about a week. You may have to add chlorine to keep it at the right level. When the water is clear, it’s always a good idea to bring another water sample back to your pool store to see what, if anything, needs to be added to enjoy the pool.

8. Maintain

For the rest of the season, keep the filter clean, vacuum the pool each week, and test the chemical levels at least once a week. DeFalco also advises having a pro test the water once a month.


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