Written by Pools Reno – Swimming Pool Repairs, Installations & Maintenance | Updated July 2025
Looking to keep your swimming pool warm and energy-efficient during chilly Cape Town evenings? Solar pool covers, often resembling bubble wrap, are an affordable way to reduce evaporation, protect your pool from debris, and retain warmth using the sun’s natural energy.
But here’s the question every pool owner asks:
Should the solar pool cover bubbles face up or down?
Let’s break it down.
Quick Answer: Bubbles Face Down Towards the Water
Always place your solar pool cover with the bubbles facing down.
This is the only way to properly transfer solar heat into your pool water, reduce heat loss, and prevent early damage to the cover.
When the bubbles face the water, they act like tiny magnifying glasses, absorbing and directing the sun’s rays into the pool. When they face up, the heat has nowhere to go – resulting in a warmer cover, not a warmer pool.
Why Bubble Orientation Matters for Cape Town Pools
Solar blankets are a popular pool heating solution across the Western Cape. However, incorrect installation reduces their efficiency and lifespan.
1. Heat Transfer Efficiency
The bubbles trap solar energy and transfer the heat directly to the pool water when facing down. This warms up your pool naturally—especially valuable during the cooler months from May to September.
2. Minimises Evaporation
South African sun and wind cause water loss through evaporation. A properly installed solar cover slows down this process, saving thousands of litres of water each year.
3. Prevents Premature Damage
When the bubbles are placed facing up, the air inside overheats, expanding beyond design tolerances. This damages the plastic and causes bubbles to burst—leading to cracking, peeling, and reduced lifespan of the pool cover.
Benefits of Using a Solar Pool Cover in the Western Cape
Whether you have a fibreglass, marbelite, or vinyl-lined pool, solar covers provide:
- Free heating using solar energy
- Water conservation (important during Cape Town’s summer restrictions)
- Less chemical use (due to reduced evaporation)
- Protection from dirt, insects, and garden debris
- Extended swimming season (enjoy warmer water from spring to autumn)
How to Install Your Solar Pool Cover Properly
Installing your solar blanket is straightforward. Just follow these tips:
- Unroll the cover over the water’s surface.
- Make sure the bubble side is facing down into the water.
- Use scissors to trim the edges to fit your pool shape snugly.
- Remove the cover during heavy rains or storms to prevent damage.
- Always store your solar cover in the shade when not in use for extended periods.
Tip: Use a pool cover roller to make removal and storage easier.
Common Mistakes Pool Owners Make
- Bubbles facing up: Leads to no heat transfer and premature breakdown.
- Covering a dirty pool: Traps algae and promotes bacteria growth.
- Not using a roller or storage reel: Leads to folding damage and tears.
Is a Solar Pool Cover Enough for Year-Round Heating?
While solar covers are effective, they work best in combination with other solutions like:
- Pool heat pumps
- Solar heating panels
- Black solar rings or liquid solar covers
If you’re in Bellville, Durbanville, Somerset West, or the Southern Suburbs, Pools Reno offers complete solar heating installation and pool equipment upgrades tailored to your property.
Related Pool Services from Pools Reno
- Swimming Pool Repairs in Cape Town
- New Pool Installations
- Pool Heating Systems Installation
- Pool Maintenance & Cleaning Plans
We proudly serve the Cape Town metro and surrounding areas including Stellenbosch, Paarl, and Table View.
Final Thoughts: Bubble Side Down – Always
Installing your solar pool cover with the bubbles facing down is critical to ensure proper heat transfer and prolong the life of your pool cover.
Whether you’re dealing with seasonal temperature dips or aiming to cut energy costs, a solar blanket can be a powerful addition to your pool setup.
Need help with solar heating or cover installation?
Contact Pools Reno Today
Let our expert team assist with pool solar covers, heating systems, and maintenance tailored to the Cape Town climate.
📍 Visit our website or call us today for a free consultation.
Frequently Asked Questions
Do solar pool covers really work in South Africa?
Yes! In sunny regions like Cape Town, solar covers can raise pool water temperature by up to 8°C and reduce evaporation by over 90%.
Can I use a solar pool cover on a heated pool?
Absolutely. It will help maintain the heat and reduce electricity usage from your pump or heating system.
How long does a solar pool cover last?
With proper care, expect 3–5 years. Keeping the bubbles down and storing it out of direct sunlight will extend its life.
How do I clean a solar pool cover?
Use a hose and soft brush. Avoid harsh chemicals or scrubbing that could damage the plastic.
