Pool Tips

Cloudy Water

We often get customers in Durban North who have cloudy swimming pool water. It can be very frustrating if the customer seems to be doing everything correctly, but the pool just isn’t playing ball!

There are a number of different reasons that this could happen, and below are some of the checks you can do on your swimming pool if the water is cloudy.
What are the possible causes of blue-cloudy swimming pool water?

  • Poor water circulation?                      
  • Is the pH too high?
  • Is the Total alkalinity too high?
  • Is there too much bacteria in the water?

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Here is a check list for each of the above possible scenarios:

Poor water circulation

  • Make sure your swimmming pool filter and pump system is in good mechanical condition.
  • Make sure your sand in the filter is clean. (You can use a filter sand cleaner if the sand is over a year old)
  • Run the pump and filter for 24 hours a day until water clears up. Thereafter, 10 to 12 hours in summer continuously, and 6 to 8 hours in winter continuously.
  • Use a water clarifier to speed up the clarifying process.

High pH

  • Adjust pH to 7.4-7.6
  • If you are using sanitizers which raise the pH like calcium hypochlorite for routine chlorination, check the pH regularly and use acid to lower the pH.

Total Alkalinity too high

  • Reduce to the correct level using a larger quantity of acid than when you adjust the pH.
  • Check Total Alkalinity again the next day

Bacteria in the water

  • Remove bactaria by shock dosing the swimming pool with 3 cups of granular chlorine per 50, 000l. Keep an eye on the pH, as this could raise the pH and make the chlorine ineffective

If you battle with any of the above, or need our assistance, click here to contact us


Many automatic pool cleaners (APC) cover only part of a swimming pool. This Zodiac Baracuda MX8 APC has better surface area coverage than the average APC. It also works well in small pools.

Some of the most basic things are overlooked when building a swimming pool. For example, where to position the weir, where to position the aimflow jet and the filter and pump.

Having a badly positioned weir could render the pool a nightmare to maintain. The best place to place the weir is in the middle of the length of the swimming pool so that the Kreepy Krauly or Baracuda automatic pool cleaner hoses have an equal distance to the two furthermost points of the swimming pool from the weir. Another thing to consider about positioning the weir is in which direction does the wind mostly blow? The weir should be facing the wind so that it can skim the leaves from the surface of the pool when the Kreepy isn't plugged in. (Hence the American name for the weir is the 'skimmer box'.

As a rule, if a pool is longer than 6 meters in length, we like to fit 2 aimflow jets on either side of the weir. This gives the pool maximum circulation and prevents circulatory 'dead spots' in the pool. You will be amazed at how a small consideration like this costs very little to do, and will save you heaps of time and money in the long run.

We always try, as far as possible, to place the pump and filter at the same height as the water level and not further than 10 meters away from the pool. The filtration plant can be further than 10 meters, but then it's advisable to upgrade the pump and filter to accommodate for the extra distance.

This picture below was recently taken of a swimming pool we built nearly 2 years ago (2014) and as you can see, the pool looks sparkling all year round, and our client hardly has to spend time on cleaning it.

Remember to always use a pool builder or renovation company who is registered with the NSPI. We have a code of ethics and we strive to serve our customer, giving them the best value for money for their swimming pool in Durban, KwaZulu-Natal.

Happy swimming! 

Client in Sienna

The most common type of filtration system in a swimming pool in South Africa is a sand filter. In the "old days" before sand filter was so popular, the diatomaceous earth filter (DE filter) was the standard type fitted to swimming pools.

These were extremely effective as it could clean the pool water to smaller micron than filter sand. The result of such clean water was less sanitiser chemicals were needed to maintain a healthy chlorine residual.

The reason the sand filter became so popular was because cleaning or servicing the DE filter was laborious. The sand filter only requires a quick backwash and rinse and it is good to go again.

The media used in a sand filter is silica sand. It comes in different grades or sizes, and has jagged edges to catch the dirt particles in the pool water. The best way to gauge when the sand filter needs to be backwashed is to have a working pressure gauge fitted.

When to backwash

The "clean" pressure - that is when the first new lot of sand is added into the filter tank - should be recorded (with a permanent marker) on the filter tank. Once the pressure reaches 50kPa over the "clean" pressure, the filter should be backwashed and rinsed.

If no pressure gauge is fitted to the filter, backwashing once a week in summer and once every two weeks in winter should be fine. Remember, the more swimmers in the pool and suntan lotion that goes into the sand, the quicker the pressure will build up, leading to more frequent backwashes.

The average filter has 10 000 litres of pool water an hour pumped through it. If the pump runs for 10 hours a day, that is
100 000 litres a day. After a week of backwashing - that's 700 000 litres of water - it's impossible for a two or three minute backwash to remove all the dirt from the sand that has been filtered over a week. Only the surface dirt is removed.

This is why it becomes necessary to recondition your filter sand by using filter sand cleaner twice a year. For best results, use one treatment before the swimming season starts and one after the swimming season ends.

Depending on how much the pool is used, the sand will need to be changed completely every two to five years.

BLUPOOL can service your sand filter as and when necessary, click here to contact us.