How To Clean A Swimming Pool Liner

Over time, a pool liner gets old, discolored, get dirty … To keep it in good condition for a few more years, you can easily clean it. 

Why Maintain the Liner of Pool

The pool liner is one of the most important parts of a swimming pool. If it is dirty, the color of the water may change. And over time, the liner can quickly get dirty due to the natural elements that can fall into the water (leaves, dirty rainwater, pollen, etc.), and through heavy use of the pool.

A swimming pool liner has an average lifespan of 10 to 15 years. It is important to ensure that it remains clean during all these years:

  • By making sure to maintain a good water balance (pH level, disinfectant level)
  • Be careful not to dirty it: avoid swimming after having spread tanning oil on the body for example or, even, avoid throwing things in the swimming pool.
  • By acting quickly when traces appear on the liner.

Tips for Cleaning the Pool Liner

There are liner cleaners, products specially developed to remove stains and traces of dirt on a liner. Just apply the product on a sponge, or with a cleaning glove, and rub. The idea is to proceed in a circular fashion: make circles by rubbing. This will absorb dirt particles without damaging the liner.

Other tips on how to clean the liner:

  • You can clean your pool with a  magic eraser, a white sponge, and rub the liner with a little water. It removes the most stubborn traces, without even using a cleaning product.
  • There is also what is called the silver stone. This is a clay-based, biodegradable solution. You just need to impregnate the silver stone with a sponge and rub on the traces.
  • You can finally use white vinegar. With a sponge and a little elbow grease, you can easily remove all traces on the liner.
  • To remove stains related to the presence of algae in the water, you can use a chlorine tablet (with gloves!) Or carry out a shock treatment with chlorine. 

How To Remove Black Spots From Underneath A Pool Liner

Sometimes black spots appear on the walls of your pool. This may be due to a local proliferation of algae, the presence of metal particles in the water or high humidity under the liner.

There are different types of stains, some are white and come from limestone, others are at the waterline and are caused by the sun and bathers. 
The black or green spots are caused either by algae that grow in the pool or by the presence of copper salts, iron or manganese in water, or by too much humidity under the liner.

A local proliferation of algae

Black or green spots often signify an algae invasion in your pool. The problem must be treated as quickly as possible to avoid the appearance of opaque green water.

  • Start by brushing the colored and slippery areas of your pool.
  • Then, you have to adjust the pH level of your pool, if necessary, to optimize the effects of the disinfectants. Using the following products: pH less liquid, pH more liquid, pH less powder, pH more powder.
  • It is important to ensure the proper functioning of your filter, to do a backwash to maximize its efficiency. Then turn it on to filter continuously. Using the following product: Filter and electrode descaler.
  • It is necessary to make a shock treatment using disinfectants such as chlorine or active oxygen. Using the following products: Shock catch, Chlorite, Chlorine shock tablets, Granuchlore 60, Granuchlore 90.
  • In addition, you must put a large dose of algaecide in the water. Using the following products: Algicide 100, Algicide 200, Algicide Multi.
  • Dead algae will cloud the water, so you have to use a flocculant to improve filtration and eliminate residues. Using the following products: Liquid flocculant, Flocculant in socks.

The Presence of Metal Iron’s In The Water

Black spots can also be caused by bacteria that produce hydrogen sulfide, which can migrate through membranes in liners.
In the presence of copper ions (which may come from the quality of the water or the treatment products used, such as certain algaecides or multifunctional chlorine) or iron and manganese, black spots (copper, iron, or manganese) appear. They frequently develop in the corners and hollow parts of swimming pools.
To fight against these stains, you must carry out a shock treatment with chlorine, combined with a sequestering product of metal irons.

Using the following products: Chlorine shock tablets, Granuchlore 60, Granuchlore 90, Chlorite, Metafloc.

Pink or Black Spots

Black, or sometimes pink, spots come from bacteria that have grown under your pool liner. They are due to too much humidity below it. To remove these black or pink spots, you must first lower the pH to 6, as well as the temperature. Using the following products: pH minus powder, pH minus liquid. Then, shock treatment with chlorine (about 10 mg / l). And end up filtering continuously for 48 hours. Using the following products: Shock catch, Chlorite, Chlorine shock tablets, Granuchlore 60, Granuchlore 90.

When black spots appear on the walls of your swimming pool, it is important for you to know the cause in order to carry out the appropriate treatment. In all the cases mentioned above, the problem must be quickly resolved to avoid the appearance of new spots.

How To Clean The Cartridge Filter Of Your Pool

The more a cartridge filter works, the more it clogs up. And the more it clogs, the less it is able to filter the dirt and impurities present in the water of your pool. This is why it is important to clean it regularly.

Why clean the cartridge filter?

The cartridge filter is an important piece of equipment that allows quality filtration due to its pleated filter media. The only downside is that this type of pool filter gets dirty and clogs quite quickly.
If you want to have an optimal filtration system and swim in perfectly clean pool water, it is therefore important to clean it regularly. In high season, when the pool is used every day, it is also advisable to clean the cartridge filter at least once or twice a week.

How to dismantle the cartridge filter to clean it?

The first step to cleaning a pool cartridge filter is of course to dismantle it. To do this, you must first switch off the pool pump. and close the outlet and inlet valves.
Then, once you have opened the drain plug, you will be able to access the filter cover. Once the filter cover is open, then remove the filter from its tank. Before cleaning the filter, do not forget to clean the bottom of the tank!

Note: When you have finished cleaning, replace the filter, close the drain plug, re-open the valves, and restart the pool pump.

Equipment Needed to clean the cartridge filter

To clean a cartridge filter properly, you just need a jet of water and a soft brush. For the cleaning to be done thoroughly and to be effective, do not hesitate to move all the folds of the filter, and always clean from the inside to the outside.

Note: For your convenience, there are commercially available, water jet heads and cleaning brushes that are specifically designed for cleaning cartridge filters.

Soak the cartridge filter to remove fatty deposits

To remove fatty deposits (sun oils, algae, etc.), it is also necessary to soak the cartridge filter for at least 3-4 hours (an entire night if possible) in a pool filter cleaner that can be purchased from your local pool store.
Alternatively, you can also soak the cartridge filter in a water-washing-up liquid mixture, or a water-bicarbonate mixture.
And when your cartridge filter is clogged up with mineral deposits (copper, iron, etc.), you can soak the filter for 15 minutes in a water-hydrochloric acid mixture (20 parts of water for one part of acid).

It is very important to rinse the cartridge well with water before putting it back in its tank!

How To Change A Pool Light Bulb In 9 Easy Steps

Has your pool light bulb blown? By following these 9 easy steps you will be able to change the bulb in no time.

You will need:

  • A replacement bulb
  • A replacement lens gasket
  • Flat-head screwdriver
  • Phillips-head screwdriver
  • Multimeter
  • A couple of towels

STEP 1
Turn off all the electrical power to the pool. Go to your main circuit breaker box for your house. There should be a circuit breaker for the pool. Switch it off. Then go to the pool area where you should have another electrical box, housing other circuit breakers for the pool lights and pool pump. Switch all those circuit breakers off too. You need to make sure the electricity is off because you will be working with the pool lights in the water so you do not want to get electrocuted.

STEP 2
Remove the single pilot screw from the top of the pool light housing. You will need to use a Philips or a Flathead screwdriver. Turn the screw counterclockwise. If the light is too low or if your arm is too short to reach from the side of the pool you will have to get into the pool to remove the screw and pool light.

STEP 3
Remove the light from the Niche Box by using a Flathead screwdriver. Once the light is loose, remove it from its niche box and place it on a towel on the pool deck. The lights cord would be long enough for you to do this. Wipe the light dry with a towel.

STEP 4
Remove the lights face ring, lens gasket, and lens to get to the light bulb. If there is corrosion on any of these parts they will need to be cleaned off before assembly.

STEP 5
Unscrew the blown light bulb. Wipe the inside of the light fixture clean with a towel. Screw in the new bulb. Do not overtighten it. Now fit the lens back with the new lens gasket. Lastly, refit the face ring.

STEP 6
Switch the main breaker back on to see if the new globe is working before you refit the light back in the pool. Do not switch the pool light on for more than 3 seconds when it is out of the pool as it can burn out. If the light does not work then there is generally a problem with the wiring. The pool lights wiring works on the negative side of its electrical circuit. Have a qualified electrician fix the fault if you are not confident to do so by yourself.

STEP 7
When the light is working switch off the main breaker before refitting the light in the pool. Submerge the pool light underwater for 1 minute to see if the lens gasket is sealing correctly. There should be no air bubbles coming from the outer edges of the face ring and there should be no water inside the light housing.

STEP 8
Refit the light back into the pool wall. Put the wiring into the niche first then refit the pool light. Tighten the pilot screw clockwise back into the top of the pool light housing.

STEP 9
Turn the main breaker back on to double-check that the light works. You have successfully replaced your pool light globe in about one hour. Well done. Enjoy your swimming at night.

How To Get Rid Of Black Algae In Your Pool

Black algae are small living organisms that penetrate porous pool surfaces like gunite and concrete. The black algae roots grow into the cracks of the plaster where they lock-in and don’t like to let go.

There is an effective way to treat black algae and eliminate them from your swimming pool water. The problem with black algae is that it has roots that grow into the cracks of the inground pools plaster. With an above ground pool, you will get the black algae that start to form together as clumps in the water. The pool cleaning process will be very much the same for both types of pools.

This is what I have been able to do to treat black algae and stop it from returning and the pool chemicals that I have used.

Before you begin. These are the Supplies you will need.

  • Backwash hose
  • Filter cleaner
  • Filter cartridge
  • Test strips / Liquid test kit
  • Algae brush
  • Chemical-resistant gloves
  • Safety goggles
  • Chlorine tablet holder
  • Telescopic pole
  • Calcium hypochlorite shock
  • Pool Shock Treatment
  • Algaecide
  • Chlorine Tablets
  • Granular ChlorineClean your filters
  • Muriatic Acid
  • Sanitizer

1. Clean Your Pool Filters

When you have black algae in your pool, you definitely have black algae in the pool filter. If you have a DE or a Sand filter, I recommend that they are back washed and rinsed at least twice.

If you have a cartridge filter and the black algae infestation is bad then I suggest removing and rinsing the filter with filter cleaner or even replacing the filter.

2. Brush The Pool Walls And Floor

If your pool surface is gunite or concrete. Then I suggest using a very stiff-bristled brush or a stainless steeled bristled brush.

If your pool surface is fiberglass or vinal. Then I suggest using a soft-bristled pool brush.

Now that you have chosen a suitable brush for your pool surface, its time to get brushing. Now you need to brush the black algae from the sides then the bottom of the pool.

What this does is loosen the black algae from the pool wall and floor surfaces and puts it into the water.

This is where the pool shock will take over and kill the black algae.

Remember the black algae is very stubborn and grows into the cracks and tiny crevices of the pools plaster. That’s why, if after the first round of brushing you still see some black algae spots left. Brush for the second time.

If after the second round of brushing there is still black algae spots then its time to use the chlorine tablet.

Put on your chemical-resistant gloves and eye goggles. Break a 3-inch chlorine tablet in half and fit it into a Pentair Algee-Gon 3 Inch Chlorine Tablet Holder with the broken tablet edge facing outwards. Attach a pool pole to the chlorine tablet holder if necessary.

Now brush those areas that were not removed by normal brushing with the chlorine tablet. What the chlorine tablets do is apply chlorine directly onto the black algae which penetrate into the roots of black algae which start killing them off immediately.

3. Shock The Pool Water

Now that all the black algae are mixed and floating in the water it is time to shock treat the pool water. I highly recommend these pool chemicals, calcium hypochlorite shock to kill the black algae. Or you may use granular chlorine.

Follow the manufacturer’s instructions to determine your pool’s volume for the correct amount of chemicals needed for shock treatment. Then either increasing the shock level of treatment to 30 ppm or times the amount by four.

If you are not too sure how much water your pool holds?

Then you can use our pool volume calculator to work it out.

It’s a good idea to put all the pool equipment you used eg tablet holder, algae brush, pool pole leaf skimmer, etc into the shallow end so that they can be sanitized during the shocking process.


Remember its best to shock your pool at sunset or at night. If you shock your pool during the day most of the effects can be lost due to the sun eating away at the chlorine before it has a chance to kill the black algae.


I would recommend adding 1Quart of Algaecide. This chemical kills and prevents algae from growing again. This helps prevent further outbreaks of black algae.

4. Run The Pool Pump

To get the shock treatment chemicals to mix with the black algae you will need to run the pool pump for the next 24hours continuously. The pool water may turn cloudy, but that’s normal.

Continue at regular intervals to brush any remaining black algae off the walls and floor of your pool. I had to brush another 4 times to make sure there were no remaining black algae spots.

5. Re Clean The Pool Filters

When the pool pump is running all that black algae is going to be sent through the filters. You will have to clean the filters again after the 24hour pump cycle to get rid of the dead black algae.

Rinse with water or use a cartridge cleaner for the filter when dealing with black algae. It also depends on the severity of the infestation that you had.

The Sand and DE filters will need to be back washed and rinsed well to make sure all black algae spores are gone.

It is possible that the filters might need to be cleaned for the 3rd time after 48hrs have passed.

6. Check For Black Algae And Shock Pool Again If Necessary

After the initial shocking of the pool. Running the pump for 24hrs and cleaning the filters. If you still see black algae on the pool surfaces, shock treats the pool again.

When you shock the pool this time only double the recommended dose. Run the pool pump for another 24hours. Continue with the brushing. At least twice a day.

7. Test And Correct The Balance Of The Pool Water

After about 2 days your pool water should be free of all black algae. Using the correct test kit, test the water PH and Total Alkalinity chemistry levels and add the appropriate chemicals as needed to bring all the levels back to where they should be.

8. Now That The Black Algae Has Gone

I am sure you are exhausted after that job. I never want to do that again.


Regular pool maintenance every week is so important. Such as cleaning out the filters, running the pump, testing the water chemistry, vacuuming the pool, brushing the pool, etc.

This little bit of work when the pool stays clean is much better than a 2day nightmare. A clean pool is easier to maintain than a dirty pool.

Weekly maintenance keeps your pool safe for your family and pets.