As fun as it is having a pool party for an occasion like Memorial Day or July 4th, there can be some consequences for having that many people in the pool. Sweat, dirt, oil, and sunscreen people may be carrying all may enter your pool.
This can alter your water chemistry and maybe even allow algae to begin growing. Being proactive with your maintenance both before and after could be the difference between swimming in clear water the next day and having either cloudy water or even a large algae bloom on your hands.
About 24-48 hours beforehand, it would be a good idea to shock your pool with Chlor Brite Granular Shock or Power Powder Plus. This boosts your chlorine level up drastically, sanitizes the pool, and then allows a nice chlorine level to be maintained using either 3” Chlorine Tabs or a your salt system. This will get your pool as ready as possible to deal with whatever swimmers bring into the pool.
An oxidizing product such as Leslie’s Fresh ‘N Clear may be during the party to help free up chlorine and reduce any oil slicks that may appear from people entering the pool. After using Fresh ‘N Clear, swimmers only need to wait for 15 minutes before entering the pool again, so it’s a great option to use when everyone is taking a break.
Afterwards, it would be a good idea to shock your pool yet again. While there should have been a good chlorine base in the pool that is hard at work sanitizing the water, it is already burning off quickly. If left as is, you may run the risk of having a low chlorine level. Therefore, shocking will introduce enough chlorine into the water to overpower whatever entered your pool and prevent your chlorine from quickly dropping. Make sure to run your pool for at least 8 hours after adding the shock at night.
As with any shock treatment, it is best to apply the chemical once the sun is down and your system is running. With your system running, debris and particulates, along with whatever has been killed by shocking the pool, can be filtered out, keeping your pool clean.
After you have completed this process, it would be a good idea to test your water either yourself or by taking a sample into a Leslie’s location. Your chemistry can change quite a bit when having a lot of people in your pool, and Leslie’s can tell you what is needed to keep your water in balance.