Selection criteria for waterproof membrane for pool

June 17,2022

Pools are often subject to external soil-based contamination due to many factors, such as groundwater contamination, water loss, algae or bacterial growth, etc. And these conditions can rely on laying an extra layer of waterproof membrane as a liner, which can reduce the generation of many uncertain factors. But how to choose the right pool liner is another big problem.

Suitable substrate

Now you can find the so-called geomembrane or waterproof membrane in many online shopping. It is said to be resistant to puncture and acid and alkali. If it is price-oriented, its thickness is mostly below 0.5mm. In fact, none of these materials can really withstand the pressure of water or being buried in the ground, and many farmed fish have sharp fins or other organs that can easily pierce the thin waterproof membrane. The water loss and pollution caused by some damages will only be discovered after a long period of time.

The thickness of the waterproof membrane usually used on the substrate is recommended to be at least 1.0mm or more. If it is to resist the puncture and wear of foreign objects, it should be used to a thickness of 1.5mm or more, or a waterproof membrane with a composite sandwich reinforced structure should be used. PVC can be used, because this material is durable, in fact, it does not burn, and there is no problem of toxic substances due to incomplete combustion.

Rough foundation

If the bottom you are laying is full of sharp and rough rocks or cement blocks, you may need to lay an extra layer of buffer layer to avoid the interaction of the two sides under the influence of water pressure and cause damage to the waterproof membrane. At this time, it is recommended to lay two layers of waterproof membrane, or directly use a double-layered waterproof membrane with a thickness of more than 2.0mm, which should reduce many unknown adverse effects. If there is still something unclear, you can also contact us directly and let our professional sales staff answer it for you.

Stretch and shrink

Some waterproofing membranes have extremely high elongation and shrinkage rates, making them unsuitable as pool substrates because they are too soft. Under the influence of water pressure, the too soft waterproof membrane is easy to collapse, and the edge fixed on the shore will be pulled apart due to the collapse, thereby causing damage to the overall structure. Therefore, it is recommended to use a waterproof membrane with a relatively low elongation and shrinkage rate as the substrate, which can also reduce the maintenance cost due to tensile damage.

Understanding the above points will give you the basic concept of choosing a pool liner. You can also choose a suitable waterproof membrane according to these points, so as to reduce the time and future installation and maintenance costs. Even if the initial cost of a good product is more expensive, in the long run, it will relatively reduce many unnecessary external costs.



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