1. High-density polyethylene (HDPE): HDPE geomembrane is a new type of waterproof material made of high-quality polyethylene resin through blow molding process. It has high density and strength, and has good corrosion resistance, low temperature resistance and aging resistance. HDPE geomembrane has a smooth surface, is easy to construct, and has good anti-seepage performance. It is one of the most widely used waterproof materials in aquaculture.
2. Avoid choosing low-density polyethylene (LDPE): Although LDPE geomembrane also has certain anti-seepage performance, its strength and aging resistance are weaker than HDPE geomembrane, and it is easy to break during long-term use, so it is not suitable for aquaculture.

Ⅱ. Specification selection

1. Thickness: The thickness of aquaculture geomembrane is generally between 0.3mm and 2.5mm. For aquaculture sites such as fish ponds, 0.4mm, 0.5mm or 0.6mm geomembranes are usually sufficient to meet the needs. Thicker geomembranes have better anti-seepage performance and durability, but the cost is also relatively high. Therefore, when choosing, you should weigh it according to specific needs and budget.
2. Width and length: The width and length of the geomembrane can be customized according to the actual size of the aquaculture pond. Generally speaking, the width is usually 6 meters, and the widest can be 8 meters; the length can be customized according to needs.

III. Performance requirements

1. High anti-seepage coefficient: The anti-seepage membrane should have an anti-seepage effect that ordinary waterproof materials cannot match. HDPE anti-seepage membrane has high tensile mechanical properties, excellent elasticity and deformation ability, making it very suitable for expanding or shrinking base surfaces, which can effectively overcome the uneven settlement of the base surface.
2. Good chemical stability: The aquaculture geomembrane should have good chemical stability and be able to resist the erosion of chemical substances such as acids and alkalis to ensure the safety and stability of water quality.
3. Strong aging resistance: After adding anti-aging agents and ultraviolet absorbers, HDPE geomembranes can effectively resist ultraviolet radiation and extend their service life.

IV. Price and cost-effectiveness

1. Price factors: The price of aquaculture geomembranes varies depending on factors such as materials, specifications, and brands. When choosing, you should weigh it according to budget and needs.
2. Cost-effectiveness: When choosing aquaculture geomembrane, not only the price factor should be considered, but also its performance, service life and construction quality. Choosing products with high cost-effectiveness can ensure the long-term and stable operation of the aquaculture pond.

V. Brand and manufacturer selection

1. Brand awareness: Choosing a brand with high popularity and good reputation can ensure product quality and after-sales service.
2. Manufacturer strength: Choosing a manufacturer with production qualifications, technical strength and rich experience can ensure the quality of the product and the smooth progress of construction.

VI. Construction and maintenance

1. Construction environment: The construction environment of the geomembrane has a great impact on its service life and effect. Therefore, before construction, it should be ensured that the ground is flat and there are no sharp objects to avoid damage to the geomembrane.
2. Maintenance: During use, the geomembrane should be inspected and maintained regularly to detect and deal with potential problems in time.