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I’m sure you just filled pool with water, now what should you do? It doesn’t matter if your pool is inground or above ground, the first thing to do is to use some pool startup chemicals to make it safe.

Treating pool water may seem like a ‘mission impossible? If you’ve never done it before. Well, we have created this guide to show you exactly what to do after you fill your pool with water and that included how to treat pool water for the first time as per the CDC guideline and various pool expert’s advice.

Steps to Follow After You Just Filled Pool with Water

So, I just filled my pool with water, now what?

Well, safety comes first, so let’s cover that now. Take the following steps to make your backyard pool safe for everyone:

  • Put Measures in place to Prevent Accidents and Injuries

Pool drowning is a real thing and there are dire consequences to pool injuries. So, you need to take preventative measures against injuries and drowning from pool startup chemicals.

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I am not trying to scare you but the leading cause of injury-related death of children is drowning and I’m talking drowning that happens in the pool.

So, build fences around the pool (or BUY FENCES ON AMAZON), install window locks and alarms as well. Lastly, never leave your children in the pool unsupervised.

Chemical related injuries involve water splashing to the eyes and sometimes on to the skin. So, every swimmer should wear safety mask or googles and you want to post aquatic safety signs around your pool.

Also, you need to post aquatic safety signs around your pool.

  • Turn on The Filter

Now, that you have taken action on all the safety issues, you need to turn on the filter as per the pool manufacturer’s instruction to begin with.

Ensure the filter is working perfectly well. If not, reach out to the manufacturer immediately. You should try to troubleshoot the problem yourself if you are knowledgeable.

  • Perform Another Vacuum Cleaning

Yes, I know you have done some cleaning in your pool, but some dirts may have found its way inside the pool as you have filled it with water.

The lingering debris can damage your pool liner. So, ensure you vacuum the bottom of your pool to get rid of that debris.

A great way to remove any floating debris is to use a pool skimmer (CHECK ON AMAZON).

  • Test the Pool Water, Again and Again

Neither you or anyone should be allowed to swim in the pool unless the water is tested and made sure it is chemically balanced. You should check the pH level and chlorine to ensure water quality.

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CDC recommended that the water pH level should be 7.2 to 7.8 so swimmers can be comfortable in the water. The ideal measure is 7.4 if you are wondering.

To make the chlorine more effective to neutralize the germs, bacteria, if you let the pH level drops below 7.2, the swimmers will gradually become uncomfortable and all the equipment in the pool will begin corroding.

Use chlorine as per direction and use them responsibly and as per the guideline.

As for the alkanity (water hardness), you need to check the whole alkalinity and ensure you set them in between 80 – 120 ppm.

Test the water to be chemically balanced again and again to make the water safe for the swimmers.

  • Safely Enjoy Your Pool

Now, that you have put safety measures, treated and tested your water, you can safely swim in your pool.

ALSO SEE: Does Bleach Freeze in Winter when Left Outside

just filled pool with water now what

Just Filled Pool and Water Is Green: Why It’s Happening?

So, you just filled pool and water is green, all the time?

Well there are three possible causes:

  • Algae
  • Copper
  • Iron or lots of metals in the water.

What to do about it?

At times, shocking new pools will cause metals to be oxidized and with the chemical reaction.

You should use a metal remover like the CuLator. You simply insert it in your skimmer basket or in your pump.

If getting rid of metals via a metal remover (CHECK ON AMAZON) is not an option for you, you simply can add some type of metal sequestrant. They do an amazing job at preventing any unwanted stains or effects.

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You achieve the best result if you treat the water with such metal control as you are filling the pool. On the other hand, you can use the right hose extension that can filter out metals to fill your pool.

If you can already filter the metals from the pool using such hose extension, your water won’t be needing any metal treatments later.

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Frequently Asked Questions (FAQs)

  • How long after filling Pool Can you Swim?

It will take 7 days before you can swim after filling the pool. But, ensure to test the water to ensure everything is okay.

  • Can You Swim in A Pool Just Filled?

Yes, but only if the liner pool water is tap water.

  • Do You Shock A Pool When You First Fill It?

Sure! Adding chlorine shocks your pool and get rid of the germs.

  • How Long Does A Pool Take To Cure?

It takes 28-60 days to cure. Within this time, your pool strengthens and hardens and you can measure the strength of the concrete by measuring its PSI.


Are you still looking for answers after you have just filled pool with water, now what? As you have just seen, it takes more than a single move to make your pool safe for swimming.

Follow our guide to treat your backyard pool nice and enjoy your-self. Let me know if you have any other queries in the comment box.

Author: Howard S. Baldwin

My name is Howard S. Baldwin. I am a work-at-home dad to three lovely girls, Jane + Hannah + Beauty. I have been blogging for the last 3 years. I worked for other Home and Lifetsyle blogs, did hundreds of product reviews and buyers’ guides. Prior to that, I was a staff accountant at a big accounting firm. Needless to say, researching and numbers are my passion. My goal is to be an informative source for any topic that relates to DIY life and homemaking.

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