Comment Retroussez une couverture solaire
All bubble covers are designed to float directly on the water surface. A solar bubble pool cover is made from a translucent material to maximise energy gain from sunlight i.e. the Sol+ Guard 500 Micron Solar Cover. A heat retention or heat absorbing bubble covers like the Gold 500 Micron Solar Cover are generally made from dark opaque coloured material, designed to minimise energy loss and absorb the suns heat. Heat reflective bubble covers are designed for very hot climates to reflect the suns heat away from the pool surface, and are generally made from light opaque coloured material designed to reflect the suns heat.
A swimming pool cover will be an ongoing commitment and for ease of handling on and off the pool a good quality swimming pool reel system should be used.
There are considerable benefits:
- A Solar Bubble cover will heat the water (& retain that heat) by up to 8 degrees Celsius
- A Solar & Heat Retention bubble cover will reduce chemical consumption by 30 – 60%
- They also cut down cleaning time by keeping dirt and other debris out of the pool
- It will conserve water by reducing evaporation by up to 98%+. Tests prove for an average sized pool 5m x 10m (16’ x 32’) around 45,000 litres (10,000 imp gallons) of water can be saved per year
- Bubble covers will reduce the filter/pump time by up to 50%
It is highly recommended that the first step in cutting pool energy loss, be the evaluation of the economics of using a swimming pool bubble cover.
How long will it last?
With UV (Ultra Violet) and pool chemicals such as Chlorine a pool cover lives in a very harsh environment. The chlorine in the water is constantly attacking it, the UV rays produced by the sun attacks it and heat will also play its part in accelerating the effects of the chlorine and UV
Bubble covers have a limited life and will only last around 50 – 125% of their life span depending on the amount of care given by the owner.
The environment in a pool is created by:
- The amount of UV rays produced by the sun.
- The volume of swimming pool chemicals (such as chlorine) in the pool water
- The chemistry parameters that balance the pool water (pH) Potens Hydrogen, (CH) Calcium Hardness, (TA) Total Alkalinity
- The heat of the pool water (whilst the cover is on the pool)
- The heat generated in the pool cover (whilst the cover is off the pool water)
- A combination of all the above factors
To summarise: A swimming pool with a high volume of chlorine / unbalanced water, will reduce the lifespan of a bubble cover, and speed up the process of degradation.
How to increase the life span
Ensure the pool water is balanced
- Potens Hydrogen (pH) Ideal 7.4 range: 7.2 to 7.8If the pH is too low the water becomes very corrosiveIf the pH is too high scaling will occur
- Calcium Hardness (CH)Ideal 275 range: 150 – 400 ppmIf the CH is too low the water becomes corrosiveIf the CH is too high scaling will occur
- Total Alkalinity (TA)Ideal 100 range: 80 – 120 ppmIf the TA is too low the water becomes corrosiveIf the TA is too high scaling will occur
Do not allow the FC (Free Chlorine) level to exceed 4.0 ppm (4 parts chlorine to 1 million parts water, which is 4 ml per litre) the ideal 2.0 ppm range is between 1.0-3.0 ppm. The ideal CC (Combined Chlorine) level is 0 ppm and should not exceed 0.2 ppm
These levels provide a guideline of recommended ranges for safe bathing. Consult your water treatment supplier for further information.
When a pool is “shock dosed” with shock chlorine, ensure the pool cover is completely removed from the water surface area and replaced only when the chlorine level is back to normal.
High chlorine levels and unbalanced pool water will increase the corrosive effect on the pool cover and lead to premature aging, bleaching, discolouration and crystallization of chemical residue on the top surface of the bubble cover.
Chlorine in its natural state is a gas, however, when it is added to the pool water (solid, liquid or gas) it automatically reverts back to its natural state (a gas) and rises through the water then dissipates into the atmosphere though evaporation. When a bubble cover is installed on a pool this evaporation does not occur, and the chlorine re-circulates through the water, a movement created by the pool pump and filtration equipment. This action sanitizes the water. The volume of chlorine in the pool will increase, when the cover is installed and the water will test higher. To avoid a higher concentration of chlorine the level and input of chlorine must be reduced, between 30 – 60 % Turn down the controls on your automatic dispenser or salt-water chlorinator, if physically adding, reduce the quantity to obtain the correct chlorine levels and water balance.
Ensure your pump and filtration system is operating during the hot part of the day 10.00 am to 4.00 pm whilst a solar or energy absorbing cover is installed on a pool. The sun heats the water penetrating through the solar cover or absorbs, heat through heat retention bubble covers, warmer water rises together with the chlorine gas, while the water beneath remains cool. We need to relieve the heat and get the chlorine moving throughout the water again. This will mix and circulate the concentrated level of chlorine, warmer and cooler water, and keep the build up of chlorine away from the cover. All of this will gain the best benefits from the solar pool cover and will help to prolong its life.
Shrinkage of polyethylene bubble pool covers
Creases in the material formed by folding or rolling the cover when off the pool can affect the fit. Another phenomenon that has been observed is when the air in the bubbles expands and the pressure increases within the bubbles. The tension within the material will rise and a slight reduction in the cover size will occur. This “gassing up” phenomenon appears to be connected to water temperature and an imbalance of water treatment. Often in this situation close examination of the bubbles will reveal small amounts of moisture within the actual bubbles caused by condensation. The pool chemistry must be tested and brought back to within recommended parameters as quickly as possible to avoid permanent damage to the cover. Finally, if covers are left exposed to direct sunlight when off the pool, high temperatures can build up in the material. These temperatures can reach levels where permanent deformation will occur in the material, which will lead to further shrinkage usually seen as wrinkled strips across the pool cover . Our recommendation is that, when producing a pool cover, 2% of the pool dimensions is added to the cover size, to allow for possible shrinkage.
Always install and use a good quality reflective storage cover when the cover is off the pool.
The problem of collapsed bubbles in swimming pool covers
For many years the swimming pool bubble cover industry has experienced bubble deflation in a very small number of bubble covers. Tests carried out by Plastipack have confirmed this problem is linked to the build up of combined chlorine, and the accumulation of nitrogen trichloride gas directly under the bubble cover.
The most common sanitizer used in swimming pools is chlorine. When added to pool water chlorine carries out two main functions; primarily it destroys micro-organisms but it also acts as an oxidizer, destroying organic contaminates. One result of these chemical processes is to convert the active free chlorine into chloramines and other chlorine compounds.
It is recognised within the pool industry that free chlorine levels of between 1 and 3 ppm along with combined chlorine levels kept well below 0.5 ppm is the ideal condition for well balanced and healthy pool water. However, if this ratio is allowed to reverse, and the chloramines or combined chlorine levels climb above the levels of free chlorine, then nitrogen trichloride gas is produced. This is the cause of that familiar chlorine smell, along with irritation of the eyes of pool users.
When this problem occurs it is important to bring back the pool water to an acceptable balanced level of chlorination, either by shock dosing and burning out the high levels of combined chlorine, or carrying out a partial water change, before a replacement cover is introduced onto the pool water surface area.
When shock dosing the pool water it is essential to remove the bubble cover until an acceptable chlorine levels and water balance is reached.
If nitrogen trichloride gas is allowed to build up under the bubble cover, air will diffuse out of the bubbles, causing them to deflate. Once the bubbles have collapsed it is not possible to reverse the process and a new cover will be required.
Installing a bubble cover
For covers that are not hemmed with a re-enforced edging.
Ensure the water level is correct.
Carefully un-pack the cover and lay on the water, bubble side down, smooth side facing upwards.
Trim the cover with a pair of scissors to fit around the pool wall allowing for shrinkage.
Remember not to cut off too much in one go, as it is possible to pull the cover away from the opposite wall while cutting thus ending up with a cover too small.
Cut around pool ladders ensuring radiused corners rather than square, as a right angle cut into the cover will produce a weak point that could tear. Alternatively fit ladder hinges that will lift the ladder away from the pool cover.
Handling the cover
The ideal way is to purchase a good quality pool roller that will allow you to handle the cover with ease, therefore gaining the most benefits of owning a pool cover.
If you have to physically handle the cover it is best to fan fold the cover at one end of the pool.
Always install and use a good quality reflective storage cover when the cover is off the pool.
Caring for the cover when it is off the pool
All covers must be stored in a shaded area out of direct sunlight. Never left out in direct sunlight whilst folded or wound onto a roller. The heat generated by the sun will be magnified many times, causing the degradation of the material, the results may not be immediate but they can be very serious.
The effects will be, very high heat concentrated inside the cover material, leading to the air in the bubbles expanding and forcing apart the laminated area’s causing the bubbles to join making stripes of bigger bubbles. This in itself is not life threatening unless repeated constantly. The cover can also become so hot it becomes molten and will weld itself together, thus destroying itself, or lines of degraded wrinkled bubbles appear across the pool cover that will also cause the bubble cover to shrink.
Most fabricators and suppliers of pool covers supply or have available, light opaque coloured reflective storage covers that will help protect the bubble cover against the harmful rays and heat of the sun.
Bubble covers for very hot climates
If you live in a climate that does become “too hot” check out our coolguard cover products (please call), designed to help keep your pool cool and refreshing to swim in.
Cleaning and storage of cover
When the cover is installed on the pool, less dust and debris will be prone to settle into the pool most will be blown away by the wind. (Without the cover debris will get waterlogged and sink) Airborne dust and debris can be swept to one area of the cover then extracted, or with the pool filtration running, hose the debris towards the skimmer basket.
When the pool is not in use, during the closed season, The cover can be cleaned / hosed down with fresh tap water, covered with the solar protector sheet and stored in a shaded area ideally a garage or shed.
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