How To Detect Swimming Pool leaks

The water level in a pool fluctuates constantly due to a completely normal phenomenon called: evaporation. But how do you tell the difference between evaporation or a leak? How to detect a leak? What are the places to check first? What to do to stop the leak before calling a pool specialist.

How To Detect If You Have A Leak In Your Pool

The logical first step is an observation: Look around the pool carefully for any wet, or sunken down areas. Look in the pool to see if there are any cracks.

There are two things you can do to make sure you don’t have a water leak.

1) Use adhesive tape: place a strip of tape above the water level on the wall of the pool, and wait 24 hours. If the water level has dropped more than one centimeter, you have a leak.

2)Use a transparent container: Fill a container with a few pebbles (so the container does not float) and water. Place it on the steps or where both levels can be at the same height. Leave it for 24 hours and again if you notice that the level of the pool water has dropped more than one centimeter in contrast to the level of the bucket, you have a leak. Well, you have a leak, now what?

Now you have to detect where the leak comes from.

These two areas are where the water leak will normally come from.

1)Pipes and parts that are supposed to be sealed (skimmer, inlet pipes to filter and pump, drains and outlet pipes from the pump)
2)Swimming Pool Coating (liner, tiles, concrete/fiberglass structure)

How to spot a leak in a swimming pool

The filtration system is the first to be blamed when there is a leaking pool problem. The problem may be due to the wear of a seal or a leak at the connections. Before focusing on the pool itself, it is advisable to carefully check all the plumbing joints of the pump and filter. The leak can also come from microcracks in the filters tank.

If the problem does not come from the filtration system, the second step is to stop the pump and then close all the valves, to let the pool water level stabilize for 24 hours. The water level will stabilize just below the leak. If, for example, the water stabilizes below the skimmers, it means that the leak comes from there. If it stabilizes under an outlet nozzle, then the leak is there.

A simple trick is then to put a colored die in the water by the skimmer or outlet nozzle. Whichever one you think could be responsible for the leak If the colored water is sucked out of the pool, there is a leak.

That said, the leak can also be from the drain itself, or from the pool lining. It is therefore advisable to carefully check the coating of the pool, all around the pool, where the water has stabilized. In the case of microcracks in the coating, it will be necessary to call in a professional.

Remember to also check the soil around your pool. If you notice that the ground is muddy/damp in a particular area, then there is a leak in the buried pipes. Again, it is advisable to call a professional.

Is there special equipment to find a leak in a swimming pool

There are detectors that can help find a leak in your pool.

Pressurization pump. It makes it possible to inject air or water under pressure into the pipe and then to control the pressure inside the pipes with a manometer. Constant pressure = no leakage.Pressure drop = leak.

Ultrasonic Detector. An ultra-sensitive floor microphone detects the sounds generated by the water escaping from the pipe.

Tracer gas. Gas is injected under pressure into the pipeline to exit vertically at the surface where the leak is located. A probe is used to locate the gas particles on the surface.

Infrared Thermograph. An infrared camera visualizes and measures the temperature differences between the ambient air and the water coming out of the pipe.

Endoscopic Camera. A flexible pipe fitted with a camera allows the interior of the pipes to be explored to identify a possible water leak. Thanks to a display screen and a locator, it is possible to determine the location of the leak.

Good to know. Considering the expensive price of this equipment, it is advisable to call a professional who is already equipped with it. The price of the intervention will be lower than the purchase of any leak detector kit.

How To Repair A Leak On A Swimming Pool

Leak at the filtration pump. If the seals are worn, just buy new ones and change them. This procedure is relatively simple and can be done without the help of a professional.

Leak at parts that are sealed. If the leak comes from the seals, it is possible to replace them yourself but if the part is incorrectly installed, it is better to call a specialist who can give you the benefit of his know-how.

A leak from underground pipes. This type of leak is the most delicate of all because it is difficult to gain access to the buried pipes. Fortunately, there are repair techniques that can help stop leaks from the inside of the pipe.

A leak in the liner. If you find a microcrack in the liner, it can be repaired with a special repair kit. To use underwater, it avoids you to empty your pool. If the tear is too great, it is better to replace the entire liner with a new one.


There are products that you pour into your pool skimmer, with the pump on to seal the underground or internal pipe leaks. If the leak is small it will be sealed. How these products work is that when this solution that is in the pool water comes into contact with oxygen it hardens and stops the leak. If the leak is too big, it will not seal. then you will have to call a professional.

I hope that this article will help you in finding the leak in your pool.

What Causes Black Algae To Grow In Your Pool?

There are many different types of algae that one can find in a pool. Black Algae is the worst. Black Algae has the most resistance to chlorine and other chemicals than any other type of algae.

The reason for this is that the black algae have tiny tentacles that grip into the porous pores of a gunite and concrete pool.

You will also get black algae in fiberglass and vinyl pools as well. The only difference is that it is easier to clean the fiberglass and vinyl pools.

WHAT DOES BLACK ALGAE LOOK LIKE?

Black Algae are living organisms that have hard outer shells that grow and cling to porous pool surfaces. Black algae take the form of black or blue-green spots and can be clumped together with raised heads.

They do not float in the water. Black Algae do not brush off the pool walls easily either. They are the worst form of algae and the most difficult to get rid of.

WHAT CAUSES BLACK ALGAE TO GROW IN YOUR POOL?

Black algae can enter your pool in various ways.

  1. From people’s bodies. If they have been swimming in a river, dam, lake or the sea, just before swimming in the pool.
  2. From people’s clothes, if they were swimming in a river, dam, lake or the sea just before swimming in the pool.
  3. Any animal that gets into pools water can have the black algae on there fur or paws.
  4. Pool Accessories, pool equipment, can all carry black algae into the water if these things are not regularly hosed off with water or washed off with diluted bleach.
  5. Swimming clothing should always be washed before it is worn to swim.
  6. Black algae will form if the pool circulation system is not functioning correctly.
  7. Black Algae will form if the pool filtration system is clocked or has not been maintained therefore cannot remove contaminants out of the water.
  8. If the PH level of the pool water is too high.
  9. If the pool pump is not running for a long enough period. Recommended period 8 to 12 Hours a Day.
  10. When the pool pump is not running every day.
  11. When the amount of chlorine in the pool water is too low.

How to remove Black Algae is a hard job, unfortunately, somebody has to do it. You can save money by doing it your self with a bit of help from the family. You can read how I got rid of black algae in my pool.

How To Unblock A Pool Skimmer Line? A Complete Guide

A Pool Skimmer is one of the most important components of a pool’s circulatory system that keeps the pool water clean. A pool skimmer’s function is to remove the floating debris from the water surface and trap the debris in a storage basket before it reaches the pool pump.

Unfortunately, that debris can sometimes block the skimmer and line to the pump. This guide will explain how to unblock your pool skimmer line.

What Are The Symptoms Of A Blocked Pool Skimmer Line?

  1. If the filter pressure drops below 10psi
  2. A skimmer basket has no debris
  3. A Skimmer basket is not pulling water into itself.
  4. If you have two skimmers, one will be full of debris while the other one will have no debris.
  5. There will be a change in the noise from the pump. Higher pitch noise.
  6. There can be air bubbles going through the return jets in the pool.
  7. There can be no water going through the return jets in the pool.

If your pool has more than one skimmer, and you are suspecting there could be a blockage in one of the lines, then just remove the plastic cover that covers them and look to see if the water is flowing into the skimmer basket. Remember the pump must be running.
If you see no water flowing into the basket then that one is the blocked skimmer.

Equipment Needed To Unblock A Pool Skimmer Line

Skimmer plugs. (If you have more than one skimmer)
Garden Hose and High-pressure Drain Jet
A Plumbing Snake
Drain Cleaning Bladder
Cleaning net

Unblocking A Pool Skimmer Line (Step By Step Instructions)

Step 1

For safety reasons, the pool pump motor must be switched off. Switch the pool pump timer off as well. There must be no possibility that the pump will start on its own. Put protective gloves on so you won’t get injured during the unblocking process.

Step 2

Remove all skimmer baskets and discard the debris. Even if your pool has more than one.

Step 3

Fit a skimmer plug into each skimmer line that you know is not blocked. It is very important to leave the blocked skimmer line open to allow water movement through that pipe.

Step 4

Remove the pool pump basket. Some pumps will have a cover that is held on by screws and other pumps will have a screw-on lid.
To remove the screw-on lid turn it counterclockwise.

Step 5

How To Unblock The Pool Skimmer Line using A Plumbing Snake

Push the end of the plumbing snake into the skimmer line until you feel resistance. If the end has not gone too far in it could be stuck in a bend of the skimmer pipe. keep on pushing and turning the plumber’s snake until it frees its self from the bend and goes deeper into the pipe until you hit the blockage or until you think you have reached the blockage.


Now rotate the plumbing snake against the blockage until you feel that the plumbing snake is going further down the pipe. This process might have to be repeated a couple of times to make sure that the blockage is totally broken up.

You will know it is working when you start to see small parts of debris floating in the pipe. You will know when the blockage is free when the plumber’s snake can move up and down the pipe freely with no restriction. Remove the plumbing snake. The plumbing snake can be inserted from either side of the skimmer pipe that is blocked.

How To Unblock The Pool Skimmer Line Using A Drain Cleaning Bladder

Attach the drain cleaning bladder to a garden hose that is connected to an outside water tap. Push the bladder down into the skimmer line. It should be inserted at least 6 inches down the pipe. Turn the water on slowly until it is at full pressure. After the bladder fils up it will force water pressure into the pipe and the blockage should clear.

Leave the water running for a few minutes and you should see debris and water coming out the other end of the skimmer pipe. If not then try the bladder again. Before removing the drain bladder switch the water off so that the bladder can deflate to facilitate easy removal.

Also, the drain cleaning bladder can be inserted from the opposite side of the skimmer pipe if the blockage persists or to make sure that the skimmer pipe is clear.

How To Unblock The Pool Skimmer Line Using A Garden Hose

Attach an adjustable high-pressure cleaning nozzle to a garden hose pipe. Connect the other end of the hose to an outside tap.
Switch the water on so that you can adjust the nozzle so that a solid high-pressure spray of water comes out. This is what is needed to unblock the skimmer line. Now insert the nozzle and garden hose as far as you can into the intake line of the pool pump.

Make sure the skimmer pipe plugs of the unblocked skimmers are secure. Turn on the outside tap. The water will flow back towards the pool. The water pressure should unblock and blow all the debris out into the pool. Another way is to push the garden hose by its self without the pressure nozzle into the skimmer line until you can feel it pushing against the blockage.

Then turn the water on and keep on moving the hose back and forth against the blockage vigorously until the blockage starts to break apart. You will see debris flowing back into the pool or into the pump. Switch the water off and remove the garden hose.

Step 6

Remove all the skimmer plugs that were inserted into the other skimmer pipes. Remove all debris that returned into the pool with a pool skimmer net.

Step 7

Clean and replace all the skimmer and pool pump baskets that were removed. Replace all the skimmer lids as well as the pool pump basket lid.

Step 8

Switch on your pool pump and make sure water is flowing into every skimmer. This is to make sure that there is no more blockage.
After about 5 minutes switch off the pump and clean out the pump basket. This is to make sure that whatever debris was left in the skimmer lines is now gone.

Will Chlorine Kill Algae In a Pool?

Will Chlorine Kill Algae In A Swimming Pool?

Normally Yes. Chlorine kills algae and bacteria by a chemical action called oxidation.

Why Is Chlorine Used In Swimming Pools?

Chlorine is used in swimming pools to act as a disinfectant and to stop the growth of algae.
Without chlorine, most pools would be green within a few days.
It takes chorine or non-chlorine shock to kill algae. An algaecide is usually used in conjunction with a chlorine shock to kill algae.

Chlorine helps pools by killing off the algae microorganisms. It also helps in keeping down the growth of algae.


Warm pool water and chlorine levels below 1 ppm contribute to algae growth. If there is a high concentration of phosphates in a swimming pool, you can get algae growth even if the chlorine level is higher than 1 ppm.

What Causes Algae In A Swimming Pool?

The lack of proper swimming pool water filtration and when chlorine levels have been allowed to drop too low. Or when the chlorine is not acting effectively because the water is out of balance, or the pool water has high levels of stabilizer (cyanuric acid). Hot and humid sun conditions as well as if the pool has been used a lot for swimming.

Algae are spores that are blown into the pool or carried into the water in other ways, They then multiply into blooms when the conditions are ideal for them.

Algae are spores that are blown into the pool or carried into the water in other ways, They then multiply into blooms when the conditions are ideal for them.

These tiny microscopic plants feed on nutrients in swimming pool water.

How To Get Rid Of Green Algae In Your Pool

Green water or floating green algae in a swimming pool is a common problem. Several chemicals can be used for treatment. By regular swimming pool maintenance, you can prevent green algae from returning.

How To Use Chlorine To Kill Green Algae In Your Pool Water

If your swimming pool water contains clumps of visible green algae, then there isn’t enough chlorine in the swimming pool. “Shocking” the swimming pool with chlorine is the most effective way to kill existing green algae and bring your swimming pool back to life.

Usually, this works within a time period of 1–3 days, but if the swimming pool conditions are poor, it could take up to a week.

How To Remove Green Algae From The Pool Walls


Brush the swimming pool walls and floor. Remove as many green algae as possible. This will reduce the time needed to kill and clear the green algae.

Pay particular attention to the swimming pool steps, ladders, and other areas where algae tend to form.

Make sure that the brush matches your swimming pool. Steel brushes work well for concrete swimming pools, while for vinyl and fiberglass swimming pools nylon brushes are preferable.

Test The pH Level Of The Water


Balance the pH by adding either an acid or a base to bring the level to just around 7.8 before treating the pool. This is at the high end of the range that you would normally have in your pool, but when you treat it for algae, it is necessary as this increases the efficiency of your chlorine and therefore reduces the growth of green algae.

Here’s how to balance the pH level: Turn on your swimming pool pump to circulate the chemicals throughout the pool. Correct the pH level either by increasing the sodium carbonate pH or by lowering it with sodium bisulfate.

It’s more accurate to use test kits that have tablets or droppers than paper test strips. If the pH levels return to normal but total alkalinity exceeds 120 ppm, check the instructions on the pH reducer label (sodium bisulfate) to reduce the total alkalinity to between 80 and 120 ppm.

Choose a suitable chlorine Shock product. Do not use the chlorine that is used for regular swimming pool treatment. Ideally, liquid chlorine for swimming pools should be used. Sodium hypochlorite, calcium hypochlorite, or lithium hypochlorite should be included in the product.

If you have hard water, avoid calcium hypochlorite.

Avoid granular or tablet chlorine products that contain large quantities of stabilizers that should not be added to the pool. Check the product for instructions on how much to use.

Use twice the recommended amount to fight green algae for a regular shock. Use triple the amount if the water is green with thick suspended algae, or even quadruple if the steps are not visible. Add the shock directly to the swimming pool edge with the swimming pool pump running.


Because UV rays break down chlorine in sunlight, add at night as this is when the chlorine is most effective.
Before switching the pool pump on, make sure that the weir basket and pump filter are clear of all debris. If not this will lengthen the filtering process of the green algae.

Check the swimming pool after the pool pump has run for 12–24 hours.

Dead algae turn’s white or gray, either the algae are suspended in the water or it settles at the bottom of the swimming pool. Remember to vacuum the dead algae from the swimming pool floor.

When vacuuming, make sure that the multivalve is on backwash so it does not block the filter. It is advisable to reclean the weir and pump filter after 24 hours as green algae will now be trapped in these parts.

Whether the green algae is dead or not, test the swimming pool water for chlorine and pH levels.

If the level of chlorine is higher (2–5 ppm) but the green algae is still there, keep these levels constant for the next few days. If the chlorine levels have risen but are still below 2ppm, then the next evening “Shock” for a second time.

If the chlorine levels have not changed significantly, your swimming pool is likely to have too much cyanuric acid (over 50 ppm). This comes from using granulated or tablet chlorine, and your chlorine condition can be “locked”.

The only way to fight this is to repeatedly “Shock” or partially drain the swimming pool.


The chlorine strength can also be used up if leaves or other unwanted dirt is in the swimming pool as well as if the pool has not been used for a long time. So make sure that the unwanted dirt is removed. It may take a full week and several “Shock” treatments for the swimming pool to come right if this is the case.


The chlorine should kill the green algae over the next few days. Test the water daily to confirm you have the correct amount of chlorine and pH. A well-maintained swimming pool has these values: free chlorine: 2-4 ppm, pH: 7.2–7.6, alkalinity: 80–120 ppm and calcium hardness: 200–400 ppm, respectively.

Small differences are common, so there should be no problem with a slight deviation.

If you still have trouble with the green algae, add coagulant or flocculant so that it clumps the algae together. Once there’s no green color left in the pool, vacuum up (set multivalve to backwash) all the dead algae until the water is clear.

You could let the filter handle it, but make sure the filter is clean first. If you do not thoroughly clean the filter, the filter can get blocked by the dead algae.

Check for the proper functioning of the swimming pools water jets.

They should point at an angle in the water so that the water moves in a spiral pattern around the swimming pool to get the most effective circulation for filtration.


Adding flocculant or coagulant is the fastest way to make your swimming pool water look good, but it’s not safe to swim in this water. Follow this with a treatment of chlorine “Shock” to sanitize the pool and do not swim in the pool until the levels of chlorine and pH return to normal.

How To Treat Pool Water With Algaecide

Algaecide will surely kill your green algae, but it may not be worth the side effects and expenses. Some algaecide products, especially if you have black algae as well, are not powerful enough to treat an existing problem.

Ask a pool store for help, or find a 30 percent + active ingredient product.


Quaternary ammonia algaecides (“poly quats”) are inexpensive but foam your water. This is annoying to many people. Algaecides based on copper are more effective but costly. They also stain the walls of your pool.

How To Remove Phosphates From Pool Water

In water, algae feed’s on several nutrients, particularly Phosphates. Phosphate test kits are available to test swimming pool water for these chemicals.

Use a commercial phosphate remover from a pool store if they are in the water. When adding Phosphate remover to swimming pool water, let the pool pump run and the water must circulate through the filter for 24 hours.

About 300 ppm is an executable level unless you have recurring problems with green algae. Then this level should be lowered.

Clear Swimming Pool Water.

Keeping Your Swimming Pool Water Clear Is Important

If you maintain your pool chemistry levels, algae should not grow. Test the swimming pool for free chlorine, pH, alkaline and cyanuric acid levels on a regular basis.

The quicker a problem is detected, the easier it will be to deal with. During the swimming season test at least twice a week.


A preventive algaecide can be added to a swimming pool when conditions are normal. Algaecides are best used in small, weekly doses. This will kill populations of algae before they grow. Too much algaecide can cause foaming or staining of your pool walls.