A swimming pool can be a fantastic addition to a South African home. In Johannesburg, Midrand and the surrounding areas, it provides somewhere to cool off during hot summer afternoons, creates an attractive outdoor entertainment space and, when well designed and maintained, can add to the overall appeal of a property.
But if you're considering building a new pool, one of the first decisions you'll face is whether to choose a traditional concrete pool finished with Marbelite or a fibreglass pool. Both have their advantages. The right choice depends on your property, budget, intended use and how much maintenance you're prepared to take on.
What is a Marbelite pool?
What we commonly refer to as a Marbelite pool is generally a reinforced concrete or gunite pool finished internally with a mixture containing white cement and marble aggregate. The major advantage of concrete construction is flexibility. A pool can be designed around the property rather than having the property accommodate a predetermined pool shape. That means unusual shapes, different depths, large steps, seating areas, tanning ledges and other features can be incorporated into the design. For homeowners creating a substantial outdoor entertainment area or an architecturally designed home, this flexibility can be a major advantage.
What is a fibreglass pool?
A fibreglass pool generally consists of a prefabricated shell manufactured off-site and installed into a prepared excavation. Because the shell arrives largely complete, installation can be considerably quicker than constructing a concrete pool from scratch. The internal surface is also smooth and relatively non-porous. This makes it more difficult for algae to attach to the surface and can reduce the amount of brushing, cleaning and chemical treatment required. The trade-off is that you're generally selecting from the manufacturer's available shapes, sizes and configurations rather than designing the pool entirely from scratch.
Fibreglass vs Marbelite at a glance
| Consideration | Fibreglass | Marbelite |
|---|---|---|
| Installation | Generally faster | Generally longer |
| Initial cost | Often lower | Often higher |
| Custom shapes | Limited | Excellent |
| Large pools | More limited | Excellent |
| Surface | Smooth | More textured |
| Algae resistance | Generally better | Requires more attention |
| Cleaning | Usually easier | More brushing required |
| Chemical requirements | Potentially lower | Potentially higher |
| Ground movement | Some flexibility | Cracking can occur |
| Repairs | Specialist repairs may be required | Established repair methods |
| Steps and seating | Predetermined by shell | Fully customisable |
| Future resurfacing | Fibreglass/gelcoat renewal | Re-Marbeliting |
Neither option automatically makes a good pool. The quality of the installation is arguably more important than the material you choose. A poorly installed fibreglass pool can develop problems, just as a poorly constructed concrete pool can crack, leak or experience premature deterioration of its finish.
Which pool is cheaper to maintain?
There is a common assumption that fibreglass pools are dramatically cheaper to run.
That's only partly true.
The biggest ongoing electricity consumer associated with most pools is the pump. If two pools contain the same volume of water and use the same pump and filtration equipment for the same number of hours, their electricity consumption will be broadly similar regardless of whether the pool is fibreglass or Marbelite.
Where fibreglass can have an advantage is in cleaning and chemical consumption. Its smoother, less porous surface makes it harder for algae to establish itself, potentially reducing brushing and chemical requirements. For a typical residential pool of around 30,000–45,000 litres, homeowners should nevertheless budget for electricity, chlorine or salt, balancing chemicals, water top-ups and cleaning consumables.
Depending on the size of the pool, equipment, electricity tariff, season and maintenance routine, a reasonable broad DIY operating budget could be approximately R900–R1,900 per month for fibreglass and R1,100–R2,300 for Marbelite. These figures should be treated as budgeting guidelines rather than fixed costs. An old oversized pool pump running for long periods can cost considerably more, while a correctly sized modern energy-efficient pump can reduce electricity consumption substantially.
The equipment matters more than many homeowners realise
When budgeting for a new pool, it's tempting to spend most of the available money on the pool itself and save on the pump, filtration system and cover. That can be false economy. An energy-efficient or variable-speed pump, properly sized filtration system, salt chlorinator and good-quality pool cover can have a significant impact on the long-term cost and effort involved in owning a pool.
A cover is particularly worth considering. Reducing evaporation means using less water, while keeping leaves and debris out of the pool reduces cleaning requirements. Limiting sunlight reaching the water can also help reduce chlorine loss and algae growth.
In other words, the cheapest pool to install isn't necessarily the cheapest pool to own.
Bigger isn't always better
South Africa has plenty of older homes with enormous swimming pools. While they can look impressive, homeowners should remember that every additional litre of water needs to be filtered, treated and maintained. A modern family may get just as much enjoyment from a well-designed 25,000–40,000 litre pool as from a much larger 60,000–80,000 litre pool. A smaller pool can also leave more garden and entertainment space available — increasingly important as residential stand sizes become smaller. If you're building from scratch, think carefully about how you're actually going to use the pool rather than simply installing the biggest pool the garden can accommodate.
The pros and cons of fibreglass
Advantages
Fibreglass pools are generally quick to install, have a smooth and comfortable surface and require comparatively little maintenance. Their non-porous surface can make algae management easier, and they work particularly well for conventional small- to medium-sized residential pools. They can also be a good match for salt chlorination systems and may provide some flexibility where minor ground movement occurs.
Disadvantages
The biggest limitation is design. You're generally choosing from predetermined shell sizes and shapes. Access to the property can also become an issue because the shell needs to be transported to the site and positioned in the excavation. Quality is important too. Poor manufacturing or installation can lead to problems including movement, surface deterioration or blistering, while some fibreglass repairs can remain visible.
The pros and cons of Marbelite
Advantages
Concrete construction gives homeowners enormous design freedom. The pool can be almost any shape, size or depth and can incorporate custom stairs, seating, shallow areas, water features or architectural elements. This makes concrete particularly attractive for large pools, lap pools and homes where the swimming pool forms an important part of the overall architectural design.
Disadvantages
Construction generally takes longer and costs more. The Marbelite surface is also more porous than fibreglass and needs greater attention to water chemistry and cleaning. Over time it can become stained, rough or damaged and will eventually require resurfacing. The concrete structure may last for decades, but homeowners should regard the internal finish as something that may need to be renewed during the life of the pool.
What about resale value?
This is where homeowners should avoid overcapitalising. From a property perspective, buyers are generally less concerned about whether a pool is fibreglass or Marbelite than they are about its condition, appearance and apparent maintenance requirements. A sparkling, modern, appropriately sized fibreglass pool can be considerably more attractive to a prospective buyer than a huge neglected concrete pool requiring resurfacing, new equipment and thousands of rands in repairs.
Equally, a beautifully designed concrete pool integrated into the architecture and entertainment area of an upmarket home can become an important lifestyle feature. The pool therefore needs to suit the property. Spending substantially more on an elaborate swimming pool doesn't automatically mean adding the same amount to the home's eventual selling price.
So, which one should you choose?
For many conventional Johannesburg and Midrand family homes, a good-quality fibreglass pool is difficult to beat. Something in the region of 6 × 3 metres to 8 × 4 metres, combined with efficient filtration, salt chlorination and a good pool cover, can provide an excellent balance between lifestyle, installation cost and ongoing maintenance. For a larger or higher-end property where the pool forms an important part of the architecture and entertainment space, a custom concrete pool becomes much more compelling.
The decision shouldn't simply be "Marbelite or fibreglass?"
Ask yourself:
How much pool do we actually need? How will we use it? What will it cost to maintain? Does it suit the property? And will a future buyer see it as an asset or another maintenance bill?
Those questions are ultimately more important than the material used to build it.
A final property consideration
A swimming pool should complement a home rather than overwhelm it. Before committing to a new installation, consider how the pool affects garden space, entertainment areas, safety, water consumption, maintenance costs and the overall positioning of your property. And if you're installing a pool primarily because you believe it will increase the value of your home, speak to a property professional who understands your area first. What adds value to a family home in Midrand may be quite different from what buyers expect from a country property in Kyalami or a luxury residence in Sandton.
At LWP Properties, we believe good property decisions aren't only about what you spend on your home — they're about understanding what today's buyers value and where improvements genuinely contribute to your property's appeal.
LWP Properties | Beyond the Sale
