It is one of the most common questions we hear from pool owners across the Western Cape: when you unroll a new solar cover, should the bubbles face up towards the sky or down towards the water? It seems like a small detail, but getting it right helps your cover trap more heat, last longer and keep your pool comfortable through those cooler Cape Town evenings. Here is the straightforward answer, along with everything you need to know to fit and care for your cover correctly.
The Short Answer: Bubbles Face Down
The bubble side of a solar pool cover should face down, so the bubbles sit directly on the surface of the water. The smooth, flat side faces up towards the sun. This is the way the manufacturers intend the cover to be used, and it is the arrangement that gives you the best heating performance and the longest life from the material.
If you have been floating yours bubbles-up, you are not alone. Plenty of people assume the bubbles should catch the sun, but the opposite is true.
Why the Bubbles Go Face Down
There are a few good reasons the bubbles belong against the water:
- Better heat transfer: The air-filled bubbles act like tiny insulating pockets. Sitting against the water, they hold warmth in and carry the sun’s heat straight into the pool.
- Improved flotation and grip: The bubbles help the cover sit snugly on the surface, following the shape of the water rather than sliding around or catching the wind.
- Reduced evaporation: With the bubbles sealing against the water, far less moisture escapes. That matters in our dry Cape summers, where water loss and the cost of topping up add up quickly.
- Longer cover life: The flat side is more resistant to direct sun exposure, so keeping it facing up helps protect the cover from premature UV damage.
How to Fit Your Solar Cover Correctly
Fitting a solar blanket is simple once you know which way it goes. Follow these steps and you will have it right the first time.
Step by Step
- Unroll the cover across the pool on a calm, still day so the wind does not fight you.
- Make sure the bubble side is facing down, touching the water, and the smooth side is up.
- Let the cover float freely and settle across the whole surface.
- Trim any excess so the cover matches the shape of your pool, leaving it just short of the edges rather than draped over them.
A well-fitted cover clings to the water and follows the outline of the pool. If your pool surface itself is looking tired, chalky or rough, a fresh cover works even better over a properly finished interior. Our team handles marbelite pool resurfacing in Cape Town as well as durable fibreglass pool lining, both of which give you a smooth, easy-to-clean surface that pairs perfectly with a solar cover.
Caring for Your Solar Cover in the Western Cape
Our climate is hard on pool equipment. Strong summer sun, salty coastal air and the odd howling southeaster all take their toll. A little care keeps your cover working for years.
- Rinse the cover occasionally to remove salt, dust and chemical residue.
- Roll it onto a reel or store it in the shade when it is off the pool for long periods.
- Keep it out of direct sun when folded, as trapped heat can damage the bubbles.
- Check the chemical balance of your water, since very high chlorine levels shorten the life of any cover.
Does the Cover Colour Matter?
People often ask whether a blue, clear or dark cover heats better. Clear and lighter covers tend to let more sunlight through to the water, while darker ones absorb more heat at the surface. Whichever colour you choose, the golden rule stays the same: bubbles down, smooth side up. The orientation makes a far bigger difference to performance than the colour ever will.
Get It Right and Enjoy a Warmer Pool
Fitting your solar cover the correct way, bubbles facing down, is a small change that pays off with warmer water, lower evaporation and a longer-lasting blanket. It is one of the easiest ways to extend your swimming season here in the Western Cape without spending a cent on heating.
If your pool needs more than a new cover, whether that is a full resurface or advice on the best finish for our climate, feel free to get in touch with our team. You can also browse the rest of our services on the Aquatic Pools website to see how we help Cape Town pool owners keep their pools in top shape all year round.
