How do I take care of a thermal cover and extend its lifespan?

Correct care and storage is important for the longevity of your thermal pool cover. Click here to download a guide on how to care for your cover and extend its lifespan. Please also see our Covers for Covers range of tailored covers for different products.

Handling of thermal pool covers

Always handle thermal pool covers with care and avoid scraping the bubble surface on or over any obstacles.


Please note that the thermal cover is designed as an insulating cover and not as a child or pet safety cover. It must be completely removed from the pool before swimming and under no circumstances should anyone stand, sit or jump on the cover. Never swim with a thermal cover on the pool or when the pool is partially covered.

Rollup Stations

Deploying the thermal cover: when pulling the cover over the water, ensure that the Rollup Station is secure, otherwise it may be pulled into the pool. If you have a Rollup Station, protect the handle and do not pick up the station by the handle but rather use the neck area when carrying. Do not allow adults and children to sit on the Rollup Station.

Leading Edge

Focus on protecting the light blue reinforcing as it is in this area that covers take the biggest abuse! Check that the C-clamps are in place and secured tightly by the fitted white nylon bolts and washers. Check regularly and tighten when necessary. Replace lost or missing components immediately, as the cover will wear faster without them. The guide rope on the leading edge should be long enough to enable the user to walk around the pool and once opposite the cover, pull the cover closed. Ensure that there is sufficient length. Use the rope to secure the cover when not in use by winding the rope around the cover. Secure neatly. Never let the reinforcing on the leading edge hang on the ground.

Attachment Kit

The cover is secured to the Rollup Station with an attachment kit. Check that all blue toggles are in place and on the cover. Replace when required. Check attachment kits regularly. Ensure that there are no sharp objects affecting the cover. Roll up in a clockwise direction. This will enable the cover to lie flat on the Rollup Station.


Always cover the thermal blanket with the UV protection sheet provided when not on the pool. This will ensure a longer life span for the thermal cover.


While wind protection devices can be added to a cover, the cover must be removed from the water when the winds rise above 65km/h.


Ensure that the pool salt levels and pH etc. are all within recommended limits. In the event of a harsh chemical treatment, remove the thermal cover from the pool for a couple of days. Chlorine, when added to pool water, automatically reverts back to its gaseous state (a gas) and dissipates into the atmosphere though evaporation. When a cover is on the pool, evaporation is dramatically reduced which can lead to a chlorine build up. To avoid a higher concentration of chlorine, the level and input of chlorine must be reduced.

What is shrinkage and how do I counteract this?

When thermal bubble covers first came onto the market, there was limited technology invested in the actual bubble and the material was relatively predictable in terms of how it reacted when in the pool environment, but their performance and longevity was nothing like our GeoBubble covers of today. As materials have become more durable, have greater UV stabilisation and are so much more sophisticated in their unique performance, thermal bubble materials have become susceptible to shrinkage. It is agreed in the industry that the heightened performance and longevity of “next generation” bubble covers like GeoBubble far outweigh the shrinkage issue, as the shrinkage can very easily be addressed by simply adding a small percentage to the length of the cover. Shrinkage will not always occur but certain factors increase the likelihood of this, including over-use of chemicals. As such, to accommodate the small chance of shrinkage, we strongly recommend all GeoBubble covers are ordered at 2% longer on the length measurement (width can be exact). Click here for a guide on how to do this measurement. This extra length can easily be tucked under and therefore not visible when the pool is covered. You may of course order your exact length but please check warranty terms and conditions before purchasing because if shrinkage occurs you may not be able to rectify this under your warranty terms.  It is not our policy to add material to accommodate shrinkage after it happens. This applies to EnergyGuard, Sol+Guard and Thermal GeoBubble covers only.

Adjusting chemical input for pools with GeoBubble pool covers

For good chemical balance and correct pH we recommend following the same treatments as you would without a pool cover.

A common error with pool covers is to not use the right amount of chemicals because the water is not visible due to the cover. As it warms up in summer, so you need to regularly treat your pool albeit at a lower level.

  1. For example, most pool chemicals – HTH chlorine types or even the salt water chlorinators – are sanitizing the pool water from debris and dust. With a pool cover this is no longer the case as most dust does not enter the pool and there are a limited number of leaves and debris which do enter the water. This reduces the work of the filtration system and chemical input is greatly reduced due to the leaves, dust and debris not entering the pool in the first place.
  2. Chlorine is a gas. As you add it to water, so it dissipates in the form of a gas. With a cover on the pool so the chlorine stays solvent in the water and does not turn into a gas and leave the water. So, because you are keeping it in the pool, you need less chlorine. This is easily seen with salt water chlorinators where the chlorinator must be turned down quite considerably with a pool cover in use.
  3. With an increase in temperature in summer, one needs more chlorine to stop algae growth. The water temperature under a GeoBubble cover will be up to 8 degrees higher depending on the cover type, so more chlorine is required to combat algae.

However, if you take the overall effect of the cover with points 1 and 2 reducing the need for chlorine, and point 3 increasing the need for chlorine, the net effect of a pool cover is that overall it will reduce the need for chlorine. This has been shown in test conditions by pool cover manufacturers and is scientifically proven.

Data has been gathered on this topic and academic papers written by the University of Brighton and the London Metropolitan University. All testing was carried out using strict scientific methods to ensure that the findings are accurate. Base academic documents on the findings are available. An EnergyGuard case study written in 2013 gives a breakdown of these test conditions and findings however the GeoBubble material has been upgraded and advanced significantly since the case study was written. Click here to read the case study https://www.powerplastics.co.za/wp-content/uploads/2013/10/energyguard_case_study.pdf.

In summary, the best way to get your chemical balance and pH right is to start from your normal uncovered pool levels and then, with the pool cover on, adjust the chemical levels slowly until you get the right balance. Every pool is different, and chemical input can also be impacted by the amount of pool traffic / frequency of swimming as that also adds impurities (eg skin cells, oils and hair) to the water that then need to be sanitized. You will also need to adjust chemical input slightly according to the season.

Questions? Or have you any great tips to share on this topic? Drop us a line on info@powerplastics.co.za

How to measure a pool for a thermal cover?

Click here for a guide to measuring a pool for a thermal cover


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