Uh-oh, is your pool green? Everybody loves having a swimming pool where they can take a dip when the mood hits. But maintaining that crystal clear water isn’t always easy.

Regularly inspect your pool to prevent the occurrence of green water or the onset of algae growth. If you are away from the pool for a long time, you might be greeted by an algae-filled water body upon return.

Clean Green Pool

Green pool water isn’t a beautiful sight, so we shall walk you through the steps of how to resolve a green pool. At the same time, we’ll also include some tips for maintaining the clear blue waters of pools in the future.

So, without further delay, let’s dive into how to clean a green pool.

Steps to Clean Green Pool Water

1. Draining the Pool

Empty Swimming Pool

Although this is the most extreme step one can take, few other options are left if the pool has turned dark green and borders on a blackish colour. In such cases, it is always more effective to completely drain the pool and treat the surface with an acid wash.

If one can see six to eight inches below the water’s surface, it is advisable to add appropriate chemicals for effective pool cleaning. If such visibility is obscured, the pool owner must decide whether to continue chemical treatment or complete draining.

2. Lowering the pH Level

Pool Ph Test

Prior to attempting to adjust the pool’s pH level, it’s crucial to test a water sample to understand its current state. Without getting into the specifics, we should inform you that there are numerous water chemistry test kits to help in this process.

The pool won’t turn green if the free chlorine levels are sufficient. So, one might skip that step. But, it is optimum to try and have it below 7.2 for this process regarding the pH level. Otherwise, the pool will likely get cloudier over the next few steps.

Once users know the pH levels, sodium bisulphate can help reduce them, and the method is straightforward. You need to follow manufacturing instructions while adding the product to the pool. Tests must be conducted again in a few hours to observe results.

3. Shocking the Pool

Adding Pool Chlorine

After adjusting the pH levels, the next essential step is a chlorine shock treatment to address the pool’s severe chlorine deficiency and stabilize the cyanuric acid levels. Adding granular chlorine or super shock chlorine helps kill off the algae and bacteria almost immediately.

While most products provide specific instructions for how much chlorine to use, the safer measure would be 30 ppm or parts per million. After the application, users are advised to check the right balance to use the testing kit.

4. Pumping and Filtering

Swimming Pool Filter

The pool’s almost ready to return to its sparkling self. But it would be best to pump and filtrate the pool water to regain balance. The filtering process depends on the type of filter used, such as a cartridge filter, sand filter, or DE filter.

Some basic things to follow include shutting the pump, rolling out the backwash hose, and checking for closed valves in the waste line. Then, the multiport valve handle must be turned to backwash, or the push and pull valve has to be slid in.

Following this, the pump has to be turned on to flow through the backwash hose or pipe. It usually takes two to three minutes for the water to become apparent. Then the valve needs to be turned to filter again. Immediately, the better flow rate and the filter tank’s lower pressure become evident.

5. Flocking the Pool

Cloudy Pool Water

Even after doing all this, the pool might remain a little cloudy. This is primarily due to the residual microscopic particles, which resist pool chemicals and are small enough to escape the filtration process. The best way to tackle this is by using flocculants.

The organic chemicals help to clump the debris together to be vacuumed from the pool’s floor. It is bound to leave the pool water crystal clear.

6. Killing Algae

Algae Swimming Pool

Algae can be very persistent. Despite many feelings that this step isn’t necessary, avoiding repeating the same process in a week is crucial. Since algae have a fast growth rate and can take over the pool, killing it is mandatory.

Using an effective algaecide makes it drop to the bottom of the floor. After killing off the remaining spores, continued treatment is recommended to prevent the algae from returning.

Why Does the Pool Turn Green?

Now that you know how to treat a green pool, you should focus on the various reasons why the pool might turn green in the first place. After all, knowing the causes might help prevent them better.

An overgrowth of algae is the underlying common cause, but different factors could lead to overgrowth.

1. Improper pH Levels

If the pH level is too low, there could be eye irritation and erosion of pool materials. On the other hand, it won’t kill the algae and bacteria if the levels are high. Ultimately, pH levels being off-balance cause water discolouration.

2. Filter Clogging

Maintaining a sparkling pool becomes daunting if the filter isn’t functioning optimally; therefore, ensuring a clean filter is essential. Apart from the continued growth of algae, bacteria or debris can also discolour the water.

3. Weather Changes

Due to the increased propensity for algae blooms in warm and humid conditions, it’s imperative to exercise extra vigilance as the weather changes. For example, all the algae bloom in the summer months and will take over your pool.

Tips For Pool Maintenance

1. Maintain pH Levels

Regularly monitor the pH and chlorine levels, ideally two to three times a week, to maintain optimal water chemistry. Ideally, pH levels should be between 7.4 and 7.6.

2. Frequent Pump and Filter Checks

Given algae’s propensity to thrive in still water, maintaining a robust filtration system to facilitate water circulation is crucial. In this manner, organisms are skimmed off.

3. Using Pool Cover

Covering a pool when it is not being used keeps out a lot of debris and unwanted organisms. Further, it prevents the sun from supercharging the lingering algae spores.

4. Brushing and Vacuuming Regularly

A crucial pool care tip involves diligent scrubbing of the pool’s surfaces and vacuuming of the pool floors, helping to prevent the growth of algae and removal of dead algae.

Let’s Get Your Pool Water Sparkling!

Prevention is better than cure, so we recommend pool owners follow the basic maintenance tips to keep the waters of the pool blue. But, if you cannot stop algae growth, the simple step-by-step cleaning method should help the pool get back to normal.

Try the step-by-step guide above to clean your green pool, and let us know how well they work for your pool. Get onto it immediately if you see any green algae floating or stuck to the pool walls or pool floor. Remember to watch the ph and alkalinity levels.

If you still have issues cleaning green pools, speak to our professional pool builders in Sydney! You can call us anytime on (02) 5137 7000.

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