How can you fix your pool if it is a really dark green after putting chlorine in yesterday?

There are a few reasons why your pool might be a really dark green after putting chlorine in yesterday.

* You didn't add enough chlorine. The amount of chlorine you need to add to your pool depends on the size of your pool, the amount of sunlight it gets, and the temperature of the water. A good rule of thumb is to add 1 to 3 ppm of chlorine per 10,000 gallons of water. If you're not sure how much chlorine to add, you can use a pool test kit to measure the chlorine level in your pool.

* Your pool filter isn't working properly. A dirty or clogged pool filter can prevent chlorine from circulating properly throughout the pool, which can lead to algae growth. Make sure your pool filter is clean and free of debris. You should also backwash your filter regularly according to the manufacturer's instructions.

* You have a high level of phosphates in your pool water. Phosphates are nutrients that can feed algae growth. If you have a high level of phosphates in your pool water, you can treat it with a phosphate remover.

* Your pool water is too acidic or too basic. The pH level of your pool water should be between 7.2 and 7.8. If your pool water is too acidic, it can corrode the pool equipment and make the water more susceptible to algae growth. If your pool water is too basic, it can cause scale to form on the pool surfaces and make the water cloudy. You can use a pH adjuster to bring the pH level of your pool water into the ideal range.

Once you've addressed the cause of the dark green water in your pool, you can shock the pool to kill any remaining algae. To shock your pool, add a shock treatment product according to the manufacturer's instructions. You should also keep your pool filter running for at least 24 hours after shocking the pool.