Why no water comes out when the pump is working ?

Step 1: Calculate Required Flow Rate

Provide us with your pool's dimensions (length, width, and average depth). We calculate the pool volume and recommend equipment based on a standard 4-hour water circulation cycle. Formula: Pool Volume (m³) ÷ 4 = Required Flow Rate (m³/h). We then select the appropriate sand filter and pool pump model to match this flow rate for efficient filtration and energy savings.

Step 2: Choose Additional Equipment

• Pool Lights: Install one light every 4 meters of pool length for beautiful nighttime illumination.
• Pool Ladders: Recommended on both ends of the pool for safe and convenient access.
• Other Accessories: Skimmers, returns, heaters, or saltwater systems can be added based on your climate, bather load, and personal preferences.

Poolking offers complete equipment packages tailored for residential and commercial pools. Our experts provide free recommendations to ensure optimal performance and value.

It is recommended to replace the silica sand in your swimming pool sand filter every 1 to 2 years, depending on usage frequency, water quality, and bather load. Regular replacement ensures optimal filtration performance and crystal-clear pool water.

Main reasons for replacement:

• Media degradation from backwashing: During backwashing, the sand bed expands 1.2 to 1.3 times its volume. Constant water flow causes sand particles to collide and rub against each other, gradually breaking down finer particles and leading to sand loss.
• Chemical wear and contamination: Lower-purity silica sand can fuse or clump when exposed to fluctuating pH levels, chlorine, and other pool chemicals over time. This reduces filtration efficiency and allows more dirt and debris to pass through.

Replacing the sand periodically prevents channeling, maintains strong water clarity, and extends the overall lifespan of your sand filter.

Poolking's sand filter warranty is 3 years for fiberglass filter,2 years for plastic filter. During the warranty period,if the filters parts have any damage,we can judge the

factors according to the photos or videos, then we can offer free parts to replace. If the filters are damaged badly,we will provide a new one.

The pumps and lights are 1 year warranty,the method is same as filters.

Poolking stands behind its products with a clear and customer-friendly warranty policy to ensure peace of mind.

• Fiberglass sand filters: 3-year warranty
• Plastic filters: 2-year warranty
• Pumps and pool lights: 1-year warranty

If any product fails to work normally during the warranty period, simply send us clear photos and videos showing the issue. Our professional team will quickly assess the cause. For minor part damage, we provide free replacement parts shipped promptly. In cases of severe damage, we will replace the entire unit at no cost to you.

This efficient claims process minimizes downtime and ensures your swimming pool returns to optimal performance quickly. All replacements use genuine Poolking parts, maintaining the original high quality and performance standards.

Proper maintenance, such as regular backwashing and avoiding chemical overload, will further extend product life. Poolking’s strong after-sales support is one of the key reasons customers choose us over cheaper alternatives.

Poolking maintains strict quality control standards to deliver reliable swimming pool equipment that customers can trust. A dedicated professional Quality Control team performs 100% inspection on every product before packing.

Multi-stage testing process includes:

• First water pressure test: Conducted immediately after the filter inner tank is produced, before bobbin winding, to verify structural integrity.
• Second water pressure test: Performed after installing all connections, manhole, sightglass, and other components to ensure no leaks under operating pressure.
• Final detailed inspection: During packing, the QC team thoroughly checks fiberglass winding, tank neck, internal resin layers, and all surfaces for any flaws or defects.

This rigorous multi-step process eliminates defects, guarantees leak-proof performance, and ensures long-term durability in harsh pool environments. By combining advanced manufacturing with zero-tolerance quality assurance, Poolking’s fiberglass sand filters and pressure tanks consistently exceed industry standards, reducing customer maintenance costs and downtime.

Poolking's swimming pool equipment commands premium pricing, yet it continues to outpace competitors with approximately 50% annual sales growth. This success stems from uncompromising quality and customer-focused value that small manufacturers often cannot match.

Poolking invests in world-class automated production machinery and maintains a rigorous quality control system with zero tolerance for defects. Every fiberglass sand filter, pressure tank, and pool component undergoes strict multi-stage inspections to ensure exceptional durability and performance.

Beyond superior products, Poolking delivers fast, responsive after-sales service that builds long-term customer loyalty. Clients enjoy crystal-clear pool water, reliable equipment operation, and peace of mind knowing expert support is readily available.

While initial costs may be higher than cheaper alternatives, Poolking’s products offer lower total ownership costs through longer lifespan, reduced maintenance, fewer replacements, and better energy efficiency.

Yes, a swimming pool sand filter can use both silica sand and activated carbon together in a multi-media configuration. Silica sand primarily provides mechanical filtration by trapping suspended particles, dirt, and debris, while activated carbon excels at chemical adsorption, removing chlorine, organic compounds, odors, and improving water clarity and taste.

Best practices for layering:

• Place silica sand at the bottom layer for structural support and primary particle removal.
• Add activated carbon on top as the secondary layer for enhanced chemical treatment.

This combination delivers higher water quality, making it suitable for commercial pools or areas with heavy bather loads and organic contaminants. However, using dual media increases material and maintenance costs compared to standard silica sand alone. Regular backwashing remains essential to prevent channeling and maintain performance.